Expressway maintenance construction multistage protection system

Abstract

The invention discloses a multistage protection system for expressway maintenance construction, relates to the field of safety early warning and active protection of expressway maintenance construction, and aims to improve the protection capability of an expressway protection system. Comprising an active protection module and an online management cloud platform. The active protection module comprises a power supply unit, a video acquisition unit, a first communication unit, a data storage unit, a directional broadcast warning unit, a flash warning device, a radar-vision fusion perception unit, a light emitting diode information board and a laser flexible blocking unit. The radar-vision fusion sensing unit senses the state of a rear vehicle and recognizes the collision risk, the video collection unit collects image information during collision, the light-emitting diode information board displays front construction information, and the active protection module uploads construction data to the online management cloud platform through the first communication unit. When the radar-vision fusion sensing unit recognizes that the collision risk reaches a preset threshold value, the sound and light alarm device is started, and the laser flexible blocking unit is triggered.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of expressway maintenance construction safety early warning and active protection, and particularly relates to a multi-level protection system for expressway maintenance construction. BACKGROUND

[0002] Expressway maintenance construction is a key link to ensure road traffic capacity and driving safety. However, the construction area is in a high-speed traffic environment, with high speed and heavy traffic flow. The workers and equipment face high safety risks, and the timeliness, comprehensiveness and reliability of the protection system are required.

[0003] The existing expressway maintenance construction protection system mainly relies on single warning signs or basic early warning equipment, which has obvious limitations. The warning information transmission distance is limited, and the rear vehicles often cannot obtain the construction information in advance, so it is difficult to slow down and avoid in time. The warning means lack diversity and pertinence, and it is difficult to effectively adapt to different traffic situations. There is a lack of precise risk perception and active intervention ability, and it is impossible to identify the vehicle collision risk in real time and start emergency response. Moreover, the protection system mainly focuses on active warning, and lacks the cooperation of passive protection. When a sudden collision occurs, the protection ability is insufficient. These problems make it difficult for the traditional protection system to form a full-chain safety guarantee, and it is necessary to build a comprehensive protection system with active early warning, intelligent response and passive protection. SUMMARY

[0004] The purpose of the present application is to provide a multi-level protection system for expressway maintenance construction, which aims to solve the core problems of the traditional expressway maintenance construction protection system, such as limited warning distance, single warning means, lack of passive protection ability and untimely emergency response.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: The application provides a multi-stage protection system for highway maintenance construction, which comprises an active protection module and an online management cloud platform; the active protection module comprises a power supply unit, a video acquisition unit, a first communication unit, a data storage unit, a directional broadcast warning unit, a flashing warning device, a radar-vision fusion sensing unit, a light-emitting diode information board and a laser flexible blocking unit; the power supply unit is used for supplying power to the protection system, the video acquisition unit is used for acquiring on-site video information when a collision occurs, the directional broadcast warning unit is used for voice reminding of front construction personnel and rear vehicles, the flashing warning device is used for warning rear vehicles, the radar-vision fusion sensing unit is used for sensing the state of rear vehicles and identifying collision risks, the light-emitting diode information board is used for displaying front construction information, and the laser flexible blocking unit is used for flexible blocking of rear vehicles; the active protection module uploads construction data in real time to the online management cloud platform through the first communication unit; the construction data comprises construction area position, length and speed limit data; when the radar-vision fusion sensing unit identifies that a collision risk reaches a preset threshold, a sound and light alarm device is started and the laser flexible blocking unit is triggered, the laser flexible blocking unit displays a red no-entry sign within a preset distance in front of a lane where a risk vehicle is located, meanwhile, relevant data is synchronized to the online management cloud platform and video information is stored to the data storage unit.

[0006] The multi-stage protection system for highway maintenance construction further comprises a construction site monitoring module, a gantry information board module and a collision buffer vehicle; the construction site monitoring module acquires real-time video of a construction area, registers faces of personnel in a construction operation process, identifies non-standard behaviors through a deep learning model and takes evidence, and transmits an identification result to the online management cloud platform in real time; the online management cloud platform transmits construction data to the gantry information board module, the gantry information board module displays dynamic warning graphics and displays construction information in a vehicle navigation path; the active protection module is arranged upstream of the construction area or integrated on the collision buffer vehicle; the collision buffer vehicle is used for providing passive protection.

[0007] The radar-vision fusion sensing unit introduces a preprocessing framework based on time registration and spatial calibration to realize data fusion processing of millimeter wave radar and vision sensors; a linear interpolation method is adopted to synchronize millimeter wave radar and vision sensor data of different frequencies, and a synchronization timestamp sequence is defined as: T={t1, t2,……, t n}; a target position p(t k ) of an arbitrary vision sensor at time t k ) can be obtained by interpolation of adjacent time data p(t i ) and p(t j ): .

[0008] The directional broadcast warning unit realizes high-precision sound field control based on a sound beam synthesis technology, has a maximum sound pressure level greater than or equal to 125 decibels, and has a directivity accuracy less than or equal to 0.5 degrees, and is used to broadcast warning audio information to rear vehicles.

[0009] The flashing warning device includes pre-warning flashing and emergency flashing; the pre-warning flashing is used for normal flashing warning in the construction process, and the emergency flashing is used for intensive warning triggered after the radar-visual fusion perception unit identifies a collision risk.

[0010] The construction site monitoring module is internally provided with a high-definition zoomable camera and an artificial intelligence processing chip, is installed on the top central area of the cab of the anti-collision buffer vehicle through a liftable support, and forms a fan-shaped detection area with the anti-collision buffer vehicle as the origin.

[0011] The anti-collision buffer vehicle is provided with an anti-collision buffer pad and a guide sign device at the tail; the anti-collision buffer pad has an impact energy absorption specification greater than or equal to 900 kilojoules; and the guide sign device is used to guide the safe passing of rear vehicles.

[0012] The gantry information board module includes a variable information sign composed of a light-emitting diode module, a control host, and a second communication unit; the variable information sign is used for dynamically displaying construction information and distance prompts; the control host is internally provided with a traffic flow density analysis algorithm to realize intelligent identification of traffic states; and the second communication unit is in real-time communication with an online management cloud platform.

[0013] The online management cloud platform integrates a construction information management unit and a multi-source data fusion analysis unit; the construction information management unit is used for receiving and integrating construction area positions, construction times, worker information, equipment states, and safety behavior recognition results uploaded from the construction site monitoring module and the active protection module; and the multi-source data fusion analysis unit constructs a construction area situation awareness model by fusing video, radar, global positioning system, and behavior recognition multi-dimensional data, realizes comprehensive analysis of traffic flow, personnel distribution, and equipment states, and assists decision-making.

[0014] The first communication unit and the second communication unit support at least one of the fifth generation mobile communication, the fourth generation mobile communication, wireless fidelity, and Bluetooth.

[0015] Compared with the prior art, the application has the following beneficial effects: 1. The online management cloud platform of the application links the gantry information board module, converts construction positions, lengths, speed limits and other data into dynamic warning graphics, and synchronizes them to the approaching vehicle navigation, greatly extends the warning distance, solves the problem of limited warning range of traditional protection, the directional broadcast warning unit realizes directional voice reminding through high-precision sound field control, the light-emitting diode information board displays construction information in real time, and the normal and emergency dual modes of the flashing warning device are used to build a multi-dimensional warning system and improve the pertinence and effectiveness of early warning.

[0016] 2. The radar-visual fusion perception unit, through a preprocessing framework of time registration and spatial calibration combined with linear interpolation, achieves synchronous fusion of multi-sensor data, significantly improving the accuracy of vehicle state perception and collision risk identification. When the risk reaches a threshold, it automatically activates audible and visual alarms and laser flexible barriers, and simultaneously transmits data to the cloud platform and stores on-site images, realizing a rapid closed loop from risk identification to active intervention and information retention, solving the problem of delayed emergency response in traditional protection systems. The active protection module can be deployed independently or integrated into the crash buffer vehicle. The former provides upstream active warning, while the latter combines the high energy absorption capacity of the crash buffer pad with the traffic guidance function of the directional sign device, forming a dual guarantee of active warning intervention and passive collision protection, solving the deficiency of traditional protection systems in lacking passive protection capabilities. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a multi-level integrated sensing highway infrastructure monitoring and early warning system provided in an embodiment of this application. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of the invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or relative positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Unless otherwise specified, the above-mentioned orientational descriptions can be flexibly set in practical applications, provided that the relative positional relationships shown in the accompanying drawings are satisfied.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a communication between the internal components of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In embodiments of the invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0024] In embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0025] This application provides a multi-level protection system for highway maintenance construction, exemplarily, such as... Figure 1As shown, the system includes: an active protection module 2 and an online management cloud platform 3; the active protection module 2 includes a power supply unit, a video acquisition unit, a first communication unit, a data storage unit, a directional broadcast warning unit, a flashing warning device, a radar-visual fusion perception unit, an LED information board, and a laser flexible barrier unit; the power supply unit supplies power to the protection system, the video acquisition unit acquires on-site video information when a collision occurs, the first communication unit sends construction information, location information, and event information to the online management cloud platform, the directional broadcast warning unit provides voice reminders to construction personnel ahead and vehicles behind, the flashing warning device warns vehicles behind, and the radar-visual fusion perception unit... The sensing unit is used to sense the status of vehicles behind and identify collision risks. The LED information board is used to display construction information ahead. The laser flexible barrier unit is used to flexibly block vehicles behind. The active protection module 2 uploads construction data to the online management cloud platform 3 in real time through the first communication unit. The construction data includes the location, length, and speed limit data of the construction area. When the radar-visual fusion sensing unit detects that the collision risk has reached a preset threshold, it activates the sound and light alarm device and triggers the laser flexible barrier unit. The laser flexible barrier unit displays a red no-entry sign within a preset distance in front of the lane where the risky vehicle is located. At the same time, the relevant data is synchronized to the online management cloud platform and the video information is stored in the data storage unit.

[0026] As one possible implementation, the directional broadcast warning unit uses beamforming technology to achieve high-precision sound field control, with a maximum sound pressure level greater than or equal to 125 decibels and a directional accuracy less than or equal to 0.5 degrees, and is used to broadcast warning audio information to vehicles behind.

[0027] The flashing warning device includes early warning flashing and emergency flashing; early warning flashing is used for routine flashing warnings during construction, while emergency flashing is used for enhanced warnings triggered after the radar-visual fusion perception unit identifies a collision risk.

[0028] The initial warning flashing signal uses a fixed frequency of continuous flashing, such as regular low-frequency flashing, to convey a basic warning signal of a construction area ahead to vehicles behind. It activates automatically upon system startup without external triggering. This allows vehicles to visually perceive the construction area from a distance, giving drivers initial time to slow down and observe. The emergency flashing signal is triggered when the radar-visual fusion perception unit identifies a collision risk from a vehicle behind (e.g., excessive speed, failure to yield, lane departure) and the risk reaches a preset threshold. In this case, a higher frequency and brighter flashing signal is displayed, conveying immediate emergency information to drivers of the at-risk vehicles and on-site construction personnel. Combined with other active protection measures such as audible and visual alarms, directional broadcasts, and laser-based safety barriers, this forms a multi-dimensional emergency warning system, compelling drivers to quickly slow down and take evasive action.

[0029] For example, the radar-vision fusion sensing unit introduces a preprocessing framework based on time registration and spatial calibration to achieve data fusion processing between millimeter-wave radar and vision sensors; linear interpolation is used to synchronize millimeter-wave radar and vision sensor data of different frequencies, and the synchronization timestamp sequence is defined as: T={t1, t2,……, t n}; Any visual sensor at t k Target position p(t) at time t k ) can be obtained from adjacent time data p(t) i ) and p(t j Interpolation yields: .

[0030] The core purpose of introducing a preprocessing framework based on time registration and spatial calibration in the radar-vision fusion perception unit is to solve the problem of data asynchrony and misalignment caused by the differences in perception characteristics of different types of sensors. Although millimeter-wave radar and vision sensors can jointly perceive vehicle targets, there are differences in their sampling frequency, data output rhythm and spatial coordinate system. Direct fusion will produce large errors, resulting in deviations in the judgment of target position and motion state, which in turn affects the accuracy of collision risk identification.

[0031] Linear interpolation is a method that uses known data from adjacent moments to estimate the state of a target at any intermediate moment. The defined synchronization timestamp order is the benchmark for subsequent alignment between the millimeter-wave radar and the vision sensor. In other words, regardless of the actual sampling frequency of the millimeter-wave radar and the vision sensor, their data must eventually be mapped to this unified set of time points.

[0032] Spatial calibration in the preprocessing framework solves the problem of inconsistent target position coordinates caused by the difference in spatial perspective between millimeter-wave radar and visual sensors by transforming radar polar coordinate data into the pixel coordinate system or world coordinate system of visual sensors.

[0033] In some embodiments, the multi-level protection system for highway maintenance construction also includes a construction site monitoring module 1, a gantry information board module 4, and a crash buffer vehicle 5; the construction site monitoring module 1 collects real-time video of the construction area 101, registers the faces of personnel during the construction process, identifies and collects evidence of non-standard behaviors through a deep learning model, and transmits the identification results to the online management cloud platform 3 in real time; the online management cloud platform 3 transmits the construction data to the gantry information board module 4, which displays dynamic warning graphics and text and shows construction information in the navigation path of oncoming vehicles; the active protection module 2 is deployed upstream of the construction area 101 or integrated into the crash buffer vehicle 5; the crash buffer vehicle 5 is used to provide passive protection.

[0034] For example, the construction site monitoring module incorporates a high-definition variable focal length camera and an artificial intelligence processing chip. It is mounted on the central area of ​​the top of the cab of the crash buffer vehicle via a liftable bracket, forming a fan-shaped detection area 102 with the crash buffer vehicle as the origin. The high-definition variable focal length camera can clearly capture detailed images from near to far within the construction area by adjusting the focal length, such as the movements of workers and the operating status of equipment. The artificial intelligence processing chip provides the module with edge computing capabilities, enabling it to quickly complete facial registration, identification and evidence collection of irregular behaviors on-site without relying on a remote cloud platform, significantly improving response efficiency.

[0035] The adjustable support bracket can flexibly adjust the camera height according to the height of the construction area and the scope of the work surface, ensuring an unobstructed detection view. The center of the top of the cab of the crash buffer vehicle is the highest visual point in the construction area. Using this as the installation point can minimize blind spots, while the stability of the vehicle ensures the stability of the camera's detection image.

[0036] For example, the rear of the crash buffer vehicle is equipped with a crash buffer pad and a guide sign device. The crash buffer pad has an impact energy absorption capacity of 900 kilojoules or more; the guide sign device is used to guide following vehicles to pass safely. The crash buffer pad has an impact energy absorption capacity of 900 kilojoules or more. This performance can effectively cope with collisions that may occur with high-speed vehicles. By absorbing the huge energy generated by the collision, it buffers the impact and significantly reduces damage to construction personnel, on-site equipment, and the colliding vehicles themselves. The guide sign device can guide following vehicles to identify the boundary of the construction area in advance through clear markings, and adjust their driving routes in time, reducing the risk of collision from the source.

[0037] For example, the gantry information board module includes a variable information sign composed of light-emitting diode modules, a control host, and a second communication unit; the variable information sign is used to dynamically display construction information and distance prompts; the control host has a built-in traffic flow density analysis algorithm to realize intelligent recognition of traffic conditions; the second communication unit communicates with the online management cloud platform in real time.

[0038] The second communication unit maintains real-time communication with the online management cloud platform to ensure timely receipt of data such as the location, length, and speed limits of the construction area. Variable message signs, driven by the control host, dynamically display construction information and distance prompts, and can also synchronize construction information to the navigation routes of oncoming vehicles, thereby providing advance warnings to vehicles behind and guiding traffic flow.

[0039] As one possible implementation, the online management cloud platform integrates a construction information management unit and a multi-source data fusion analysis unit. The construction information management unit receives and integrates data from the construction site monitoring module and the active protection module, including the location of the construction area, construction time, personnel information, equipment status, and safety behavior identification results. The multi-source data fusion analysis unit integrates multi-dimensional data from video, radar, GPS, and behavior recognition to construct a situational awareness model of the construction area, enabling comprehensive analysis of traffic flow, personnel distribution, and equipment status to support decision-making.

[0040] For example, the control host calculates key parameters such as the number of vehicles, vehicle spacing, and driving speed within a unit road segment using a traffic density analysis algorithm. The algorithm presets multiple thresholds. For instance, when the number of vehicles per unit kilometer is below a certain value and the vehicle speed is stable within the high-speed range, it is determined to be smooth traffic; when the vehicle spacing decreases, the vehicle speed drops significantly, and the number of vehicles per unit kilometer exceeds the standard, it is determined to be congested traffic, thereby achieving dynamic identification of the traffic status upstream of the construction area.

[0041] As one possible implementation, the first and second communication units support at least one of the following communication methods: fifth-generation mobile communication, fourth-generation mobile communication, Wi-Fi, and Bluetooth.

[0042] The multi-level protection system provided in this application requires initial deployment before operation. The active protection module is deployed upstream of the construction area or integrated into the crash buffer vehicle as needed. The construction site monitoring module is mounted on the top of the crash buffer vehicle via a liftable bracket and its fan-shaped detection range is calibrated. The first and second communication units establish a connection with the online management cloud platform. The active protection module then uploads construction data such as the location, length, and speed limit of the construction area through the first communication unit. The online management cloud platform pushes the data to the gantry information board module, whose variable message signs display dynamic warning graphics and text, and synchronize this information with the oncoming vehicle navigation, achieving long-distance early warning.

[0043] The radar-visual fusion perception unit uses a preprocessing framework of time registration (synchronizing data using linear interpolation) and spatial calibration to perceive the status of vehicles behind and identify collision risks in real time. When the risk reaches a threshold, it immediately activates active intervention measures such as audible and visual alarms, emergency flashing of warning lights, directional broadcast warnings, and laser flexible barrier, while simultaneously synchronizing data to the online management cloud platform and storing on-site images. If active intervention fails, the directional signs on the crash buffer vehicle guide the vehicle to detour, and the rear crash buffer absorbs the impact energy, forming a passive protection backup.

[0044] The construction site monitoring module uses high-definition cameras and AI chips to collect video in real time, register personnel faces, and identify irregular behaviors. The results are pushed to the online management cloud platform and alarms are triggered. The construction information management unit of the online management cloud platform integrates all data, while the multi-source data fusion and analysis unit combines video, radar, and other multi-dimensional data to build a situational awareness model. This model analyzes traffic flow, personnel distribution, and equipment status, providing decision support for adjusting protection strategies and achieving intelligent control throughout the entire construction process.

[0045] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0046] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A multi-level protection system for highway maintenance construction, characterized in that, The system includes an active protection module and an online management cloud platform. The active protection module comprises a power supply unit, a video acquisition unit, a first communication unit, a data storage unit, a directional broadcast warning unit, a flashing warning device, a radar-visual fusion perception unit, an LED information board, and a laser flexible barrier unit. The power supply unit supplies power to the protection system; the video acquisition unit collects on-site video information at the time of a collision; the directional broadcast warning unit provides voice alerts to construction workers ahead and vehicles behind; the flashing warning device warns vehicles behind; the radar-visual fusion perception unit senses the status of vehicles behind and identifies collision risks; the LED information board displays construction information ahead; and the laser flexible barrier unit provides flexible barrier protection for vehicles behind. The active protection module uploads construction data to the online management cloud platform in real time via the first communication unit. Construction data includes the location, length, and speed limit of the construction area. When the radar-visual fusion perception unit detects that the collision risk has reached a preset threshold, it activates the audible and visual alarm device and triggers the laser flexible barrier unit. The laser flexible barrier unit displays a red no-entry sign within a preset distance in front of the lane where the risky vehicle is located. At the same time, it synchronizes the relevant data to the online management cloud platform and stores the video information in the data storage unit.

2. The multi-level protection system for highway maintenance and construction according to claim 1, characterized in that, It also includes a construction site monitoring module, a gantry information board module, and a crash buffer vehicle; the construction site monitoring module collects real-time video of the construction area, registers the faces of personnel during construction operations, identifies and collects evidence of non-standard behaviors through a deep learning model, and transmits the identification results to the online management cloud platform in real time; the online management cloud platform transmits the construction data to the gantry information board module, which displays dynamic warning graphics and text and shows construction information in the navigation path of oncoming vehicles; the active protection module is deployed upstream of the construction area or integrated into the crash buffer vehicle; the crash buffer vehicle is used to provide passive protection.

3. The multi-level protection system for highway maintenance construction according to claim 1, characterized in that, The radar-vision fusion sensing unit introduces a preprocessing framework based on time registration and spatial calibration to achieve data fusion processing between millimeter-wave radar and vision sensors. Linear interpolation is used to synchronize data from millimeter-wave radar and vision sensors at different frequencies, defining the synchronization timestamp sequence as: T = {t1, t2, ..., t...} n }; Any visual sensor at t k Target position p(t) at time t k ) can be obtained from adjacent time data p(t) i ) and p(t j Interpolation yields: 。 4. The multi-level protection system for highway maintenance and construction according to claim 1, characterized in that, The directional broadcast warning unit achieves high-precision sound field control based on sound beam synthesis technology, with a maximum sound pressure level greater than or equal to 125 decibels and a directional accuracy less than or equal to 0.5 degrees, and is used to broadcast warning audio information to vehicles behind.

5. A multi-level protection system for highway maintenance and construction according to claim 1, characterized in that, The flashing warning device includes early warning flashing and emergency flashing; early warning flashing is used for routine flashing warnings during construction, while emergency flashing is used for enhanced warnings triggered after the radar-visual fusion perception unit identifies a collision risk.

6. A multi-level protection system for highway maintenance and construction according to claim 2, characterized in that, The construction site monitoring module has a built-in high-definition variable focal length camera and an artificial intelligence processing chip. It is installed in the central area of ​​the top of the cab of the crash buffer vehicle via a liftable bracket, forming a fan-shaped detection area with the crash buffer vehicle as the origin.

7. A multi-level protection system for highway maintenance construction according to claim 2, characterized in that, The rear of the crash buffer vehicle is equipped with a crash buffer pad and a guide sign device. The crash buffer pad has an impact energy absorption specification of greater than or equal to 900 kilojoules; the guide sign device is used to guide vehicles behind to pass safely.

8. A multi-level protection system for highway maintenance and construction according to claim 2, characterized in that, The gantry information board module includes variable information signs composed of LED modules, a control host, and a second communication unit; the variable information signs are used to dynamically display construction information and distance prompts; the control host has a built-in traffic density analysis algorithm to achieve intelligent recognition of traffic conditions; the second communication unit communicates with the online management cloud platform in real time.

9. A multi-level protection system for highway maintenance and construction according to claim 2, characterized in that, The online management cloud platform integrates a construction information management unit and a multi-source data fusion analysis unit. The construction information management unit receives and integrates data from the construction site monitoring module and the active protection module, including the location of the construction area, construction time, personnel information, equipment status, and safety behavior identification results. The multi-source data fusion analysis unit integrates multi-dimensional data from video, radar, GPS, and behavior recognition to build a situational awareness model of the construction area, enabling comprehensive analysis of traffic flow, personnel distribution, and equipment status to support decision-making.

10. A multi-level protection system for highway maintenance construction according to claim 8, characterized in that, The first and second communication units support at least one of the following communication methods: fifth-generation mobile communication, fourth-generation mobile communication, Wi-Fi, and Bluetooth.

Images