379 results about "Speed bump" patented technology

The invention relates to the technical field of vehicle control, in particular to a damping attenuation compensation method and device for a basic valve system of a continuous damping adjustable shock absorber, and the method comprises the steps: collecting the current mileage of a target vehicle, so as to determine whether the target vehicle carries out the self-inspection of the continuous damping adjustable shock absorber or not; under the condition that it is determined that self-inspection of the continuous damping adjustable shock absorber is conducted, the convergence time of a target vehicle passing through a preset deceleration ridge at different vehicle speeds is obtained; correcting a damping curve of the continuous damping adjustable controller of the target vehicle according to the convergence time at different vehicle speeds to obtain a target current of the continuous damping adjustable valve, comparing the target current with a current actual current of the continuous damping adjustable valve of the target vehicle to obtain a current deviation value, and outputting the current deviation value. And performing damping compensation on the continuous damping adjustable valve according to the current deviation value. Therefore, the problems that the damping force of the basic valve system is continuously attenuated along with the increase of the driving mileage of the vehicle, and stable driving and comfort of the vehicle are ensured by conventional control software are solved.

The invention discloses an automobile seat shaking control method and device. An automobile seat comprises a seat body and an X-axis motion control motor used for controlling the seat body to move front and back. The control method comprises the steps that S1, the acceleration value A of a vehicle is obtained, and a seat motion compensation model is established according to the acceleration value A; s2, calculating a motion compensation current according to the seat motion compensation model; and S3, the motion compensation current serves as the working current of an X-axis motion control motor, and the front-back motion speed of the automobile seat is controlled. According to the control method, the seat motion compensation model is established according to the acceleration of the vehicle, the motion of the seat is compensated, and then the working current of the X-axis motion control motor is calculated according to the seat motion compensation model, so that the forward and backward motion speed of the automobile seat is controlled, the pause feeling caused by acceleration and deceleration can be avoided, and the rocking comfort of the seat is improved.

The invention discloses a vehicle-mounted road surface damage rapid detection method based on machine vision, and relates to the technical field of road surface detection, and the method comprises the following steps: S1, collecting vibration data; s2, processing the vibration data; s3, extracting an abnormal event; s4, classifying the abnormal events; s5, acquiring a pavement image; and S6, identifying the pavement damage type. The vehicle-mounted vibration detection system is arranged to measure the vehicle vibration, the acquisition speed and the measurement precision of the sensor can be improved, signal denoising is performed according to the characteristics of the vehicle vibration signals acquired by the sensor, recognition and distinguishing are performed according to waveform data generated by different vibrations, abnormal events can be rapidly and accurately extracted, and the accuracy of the abnormal events is improved. According to different energy characteristics corresponding to different abnormal events, energy of discrete signals is obtained through characteristic extraction, characteristics of non-pavement damage such as deceleration strips can be eliminated, and the condition of pavement damage can be accurately identified.

The invention discloses a road intelligent traffic multifunctional monitoring optimization system and method, and the system comprises a controller, a deceleration strip, and a traffic light assembly. The controller comprises an embedded single-chip microcomputer, a traffic flow detection module, a short-time traffic flow prediction module, a traffic state analysis module and a real-time traffic flow control adjustment module. The road intelligent traffic multifunctional monitoring optimization system not only has the capability of detecting and predicting the traffic flow in real time, but also has the function of monitoring the road traffic operation condition to give an alarm, and improves the travel experience of urban residents through intelligent regulation and control of the traffic flow. The technical problem that unnecessary waiting time or traffic jam occurs under some conditions due to the fact that traffic conditions cannot be intelligently regulated and controlled by an existing road intelligent traffic multifunctional monitoring optimization system and method, and traffic light time circulates in a fixed time interval is effectively solved.

The invention provides a torque control method and device, a vehicle and a readable storage medium, the method is applied to the technical field of vehicles, and the method comprises the steps that the slip rate of the vehicle is determined; under the condition that the slip rate of the vehicle is larger than the slip rate threshold value, responding to the situation that the vehicle is in the variable-speed driving state, and obtaining the rotating speed limit value of a driving motor of the vehicle, the current rotating speed of the driving motor and the current output torque of the driving motor; according to the slip rate, the rotating speed limit value and the current rotating speed of the vehicle and the current output torque of the driving motor, the target output torque of the driving motor is determined, and when the vehicle is in the accelerated driving state, the determined target output torque is smaller than the current output torque; when the vehicle is in the deceleration driving state, the determined target output torque is larger than the current output torque; and adjusting the current output torque of the driving motor to the target output torque so as to adjust the rotating speed of the driving motor. The method can prevent the vehicle from shaking and abnormal sound when the vehicle passes through the deceleration strip during acceleration / deceleration.

The invention discloses a vehicle damping module, and relates to the technical field of vehicle damping, the vehicle damping module comprises a road condition sensing unit, the output end of the road condition sensing unit is in communication connection with a prediction control unit, the output end of the prediction control unit is electrically connected with an actuator assembly, and the prediction control unit is internally provided with a control algorithm. The control algorithm is based on the real-time speed of the vehicle, the characteristic parameters and a pre-stored vehicle dynamics model. According to the application, the road condition sensing unit fuses multi-source information and accurately recognizes and quantifies front road condition features, and the prediction control unit accurately calculates the time point when the wheels make contact with an obstacle based on a dynamic model and the real-time vehicle speed, so that precious pre-adjustment time is reserved for an execution mechanism; the damping coefficient of the electromagnetic shock absorber and the internal pressure intensity of the self-adaptive stiffness spring assembly can be adjusted to the optimal state before impact occurs, so that the impact load generated when the electromagnetic shock absorber passes through pits and deceleration strips is greatly smoothed, and the riding comfort is remarkably improved.

The invention relates to a multi-degree-of-freedom driving simulation device, which is characterized by comprising a base, a first motion platform and a second motion platform, the first motion platform is movably arranged on the base, and the moving direction of the first motion platform is perpendicular to the advancing direction of the simulated driving; the second motion platform is arranged on the first motion platform in a pitching manner; more than two pitching driving devices are arranged between the second motion platform and the first motion platform, the pushing ends of the more than two pitching driving devices are connected with the bottom surface of the second motion platform, and the pitching driving devices are suitable for driving the second motion platform to generate pitching motion; the top surface of the second motion platform is suitable for placing a driving simulation in-vehicle assembly. Under the driving action of more than two pitching driving devices, the second motion platform can be lifted and descended in multiple directions, so that the automobile body state of an automobile driving on various roads such as uphill, downhill or deceleration strips can be simulated.

An energy generating speed bump assembly and a method for generating electrical energy therewith are described which integrate mechanical shock absorption with hydraulic power generation in a subterranean housing. The assembly includes a speed bump mounted within a channel configured for controlled vertical displacement. A helical compression spring connects the speed bump to a piston oil pump, converting vehicular kinetic energy into hydraulic pressure through a coordinated mechanical-hydraulic interface. The assembly includes a main oil reservoir and a compressed oil tank receiving hydraulic pressure to generate pressurized hydraulic fluid. The pressurized hydraulic fluid drives an oil turbine coupled to an electrical generator, facilitating power generation from vehicular traffic. The modular design of the assembly facilitates standardized installation within conventional roadway infrastructure. This integrated approach simultaneously provides traffic speed regulation and renewable energy generation while minimizing vehicular impact through controlled deceleration characteristics.

The invention discloses a device and a system for risk identification and early warning of an expressway operation area. The system comprises a portable pressure-sensitive deceleration strip, an integrated intelligent traffic cone and an engineering early warning vehicle, the two portable pressure-sensitive deceleration strips are arranged at the first-level early warning boundary and the second-level early warning boundary in front of the integrated intelligent traffic cone on the upstream of the operation area respectively and used for sending alarm signals to other associated equipment when it is detected that a vehicle on the high-speed early warning lane enters the early warning area; the integrated intelligent traffic cone is used for configuring integrated modules such as a monitoring camera, an audible and visual alarm and a character notice board according to an early warning effect when the traffic cone is automatically placed at a set position so as to identify risks inside and outside an operation area and perform early warning; and the engineering early warning vehicle is used for assisting in identifying risks inside and outside the operation area, processing early warning information and slowing down collision. By constructing the device and the system for identifying and early warning the risks of people, vehicles and equipment in the expressway operation area, the external vehicle intrusion risk and the internal personnel and equipment risk in the operation area can be actively found, an alarm prompt is given before the risks come, workers in the operation area are guided to rapidly evacuate, and casualties caused by accidents are reduced.

The invention relates to a vehicle braking control method and device and a rear-drive electric vehicle. Specifically, the invention relates to a vehicle braking control method. According to the method, a front wheel state monitoring module monitors the rotating speed and acceleration of front wheels of a vehicle in real time, judges whether the vehicle passes through a deceleration strip or not and generates a deceleration strip recognition signal. According to the identification signal, the system actively cancels braking energy recovery and sliding energy recovery so as to avoid unstable deceleration caused by energy recovery. And then, the hydraulic execution control module adjusts the pressure of the hydraulic system according to the quitted energy recovery torque data so as to compensate the braking force loss caused by energy recovery quitting. According to the method, energy recovery and brake control can be dynamically adjusted, unstable deceleration caused by the deceleration strip and impact on the speed reducer are prevented, and therefore driving safety and comfort are effectively improved.

Embodiments of the present disclosure relate to ground surface estimation using localized surface fitting. A three-dimensional (3D) surface structure (e.g., a road surface profile) may be estimated using a nonlinear optimization to fit height values to (e.g., accumulated, bias-corrected) LiDAR detections (e.g., sampled in localized regions along one or more predicted trajectories). For example, LiDAR data (e.g., detected 3D point clouds) may be ego-motion compensated, corrected for measurement bias, accumulated, and sampled along one or more predicted trajectories, and the height of each trajectory point may be fitted to the heights of the corresponding sampled points using a nonlinear optimization. As such, the resulting road surface profile (e.g., modeled along the wheel track(s)) may be provided to an adaptive suspension control system to modulate the damping characteristic of the suspension system to counteract indentations (e.g., potholes) or protrusions (e.g., speed bumps) represented in the road surface profile.

An electronic parking brake system that generates a clamping force required for parking of trailer-mounted towing vehicles includes an electronic parking brake provided on at least one of front and rear wheels of the towing vehicle; and a controller configured to receive a front wheel speed, a rear wheel speed, and a longitudinal acceleration of the towing vehicle, determine whether or not the trailer is mounted based on changes in the received front wheel speed, rear wheel speed, and longitudinal acceleration when the towing vehicle passes a speed bump, and determine the clamping force required for parking according to whether or not the trailer is mounted when parking is operated, and control the electronic parking brake to generate the determined clamping force.

The invention belongs to the technical field of piezoelectric power generation devices, and particularly relates to highway pavement piezoelectric power generation equipment which comprises a power generation deceleration strip and two plugging heads, and the two ends of the power generation deceleration strip are plugged through the two plugging heads. The power generation deceleration strip comprises an elastic deceleration strip body and a supporting deceleration strip body. The supporting deceleration strip is located in the elastic deceleration strip, and a gap exists between the supporting deceleration strip and the elastic deceleration strip and is provided with a spring. A plurality of piezoelectric plate assemblies are fixedly connected into the supporting deceleration strip, each piezoelectric plate assembly comprises a piezoelectric plate body and a counter weight, the upper end of each piezoelectric plate body is fixedly connected with the inner top of the supporting deceleration strip, and each counter weight is hinged to the lower end of the corresponding piezoelectric plate body. According to the power generation equipment, the piezoelectric plate body in the supporting deceleration strip vibrates and generates power by utilizing the impact force generated by pushing the supporting deceleration strip to move horizontally when a vehicle passes by.

The intelligent deceleration system comprises a photoelectric speed measuring device and an intelligent deceleration strip device, the photoelectric speed measuring device is connected with the intelligent deceleration strip device, and the intelligent deceleration strip device comprises a deceleration strip mechanism, a function converter mechanism, a slope adjusting mechanism, a power generation mechanism and a supporting rack. The deceleration strip mechanism is installed on the upper portion of the supporting rack, the function converter mechanism, the gradient adjusting mechanism and the power generation mechanism are installed in the supporting rack, one end of the function converter mechanism is connected with the deceleration strip mechanism, and the other end of the function converter mechanism is connected with the gradient adjusting mechanism and the power generation mechanism. A sensor in the photoelectric speed measuring device is connected with motors in the intelligent deceleration strip device through a controller, work of different functional modules is achieved, the height of the deceleration strip can be adjusted according to the vehicle speed, the emergency state of a vehicle and the like, energy lost when the vehicle passes through the deceleration strip can be collected, and the energy is saved. And energy recycling is achieved, and environmental protection is achieved.

A robot, a robot advancing method, a robot system and a computer storage medium, the method comprising the following steps: when the robot advances according to a planned path and a preset motion model, acquiring road condition information in the planned path (S10); the robot is provided with a left driving wheel and a right driving wheel located on the rear side of a body of the robot and at least one driven universal wheel located on the front side of the body of the robot. When it is determined that the planned path intersects with the deceleration strip, correcting the planned path passing through the deceleration strip according to a motion model of the robot (S11); and controlling the robot to travel through the deceleration strip along the corrected planned path in a direction perpendicular to the deceleration strip (S12).

The present invention discloses a pneumatic lifting speed bump, which comprises a lifting plate, a power assembly and a load-bearing bracket. The lifting plate is composed of longitudinal guide rails and side plates. The side plates are connected to both sides of the longitudinal guide rails. The power assembly is composed of a lifting cylinder, a damping cylinder, a high-pressure gas storage tank and a low-pressure gas storage tank. The high-pressure gas storage tank and the low-pressure gas storage tank are welded by a cross beam frame to form a groove rail with an integral structure. A number of lifting cylinders and damping cylinders are arranged alternately and evenly installed on the cross beam frame inside the groove rail. The width of the longitudinal guide rail corresponds to the groove width of the groove rail. The piston rod end of the lifting cylinder is connected to the longitudinal guide rail, so that the lifting plate and the power assembly form a mechanical body of the pneumatic lifting speed bump. An edge bracket is provided on the outer edge of the groove rail to be located on the load-bearing bracket, and the load-bearing bracket is embedded and installed in a preset ground groove pit at a traffic intersection. The present invention adopts a pneumatic lifting method with multiple cylinders and double gas storage tanks for voltage stabilization, achieving the purpose of a lifting speed bump that can pass smoothly when decelerating, give a warning when speeding, and impose a penalty through jolting.

The invention provides a control method for reducing pitching of an electric vehicle, a motor controller and the electric vehicle, and is applied to the technical field of electric vehicles, and the control method is used for adjusting torque output by a driving system in the process that the electric vehicle passes through a deceleration strip so as to improve the driving comfort. The output torque is adjusted by actively controlling the front drive motor and the rear drive motor, the backward moving degree of the gravity center of the electric vehicle is adjusted, the sprung mass of the front suspension and the sprung mass of the rear suspension are adjusted, the offset frequency of the wheel ends of the suspensions is rapidly adjusted, and the heights of the front suspension and the rear suspension change at the same frequency (for example, compression and bounce at the same time); the front axle and the rear axle of the electric vehicle are changed at the same frequency, pitching of the electric vehicle is reduced, and the driving comfort is improved in the process that the electric vehicle passes through the deceleration strip. And after the two rear wheels leave the deceleration strip, the front-drive motor and the rear-drive motor are actively controlled to adjust the output torque, the same-frequency change of the front shaft and the rear shaft of the electric vehicle is rapidly controlled, and the pitching of the electric vehicle is reduced.

The invention provides a correction deviation value obtaining method and device. According to the method and the device, the situation that the vehicle presses the elevation change object such as a well lid, a pit or a deceleration strip on the ground under the condition that the vehicle does not have actual collision is considered, so that the pressing moment when the vehicle actually presses the elevation change object such as the well lid, the pit or the deceleration strip is obtained. And the correction deviation value is obtained based on the over-pressing moment, so that subsequent error correction is facilitated. According to the method, the first distance correction deviation value of the distance sensor, the first speed correction deviation value of the speed sensor and the first moment correction deviation value of the output moment when the distance sensor outputs the distance can be obtained under the condition that the vehicle is not subjected to actual collision, so that the safety of the vehicle is improved; and the precision of the obtained first distance correction deviation value, the first speed correction deviation value and the first moment correction deviation value is not reduced.

The invention discloses an intelligent access control anti-collision barrier gate, and particularly relates to the technical field of access control barrier gates, the intelligent access control anti-collision barrier gate comprises a base, a case is fixed at the top end of the base, a blocking piece is arranged on one side of the case, a deceleration strip is arranged at the bottom of the blocking piece, and an automatic license plate recognizer is fixed at the top end of the base through a mounting frame and used for recognizing license plate information of a vehicle. A radar velocimeter is fixed on the mounting frame and is used for acquiring the driving speed and acceleration data of a vehicle in the process of approaching a barrier gate in real time, and a panoramic camera is fixed at the top end of the case and is used for shooting the driving track of the vehicle so as to judge whether the vehicle maliciously intrudes into a community or not. The vehicle behavior can be intelligently judged, so that the registration release or blocking interception process is triggered, the safety and the passing efficiency are both considered, the daily life of residents is facilitated, and the internal management of a community is facilitated.

The invention relates to the technical field of road safety facilities, in particular to a gradient effect concave deceleration strip visual grading mark design method which comprises the steps that S1, basic design data of a target road scene are obtained, and the basic design data comprise a target limited vehicle speed numerical value and a total length numerical value of a deceleration area; s2, according to the basic design data, geometric configuration parameters of a plurality of concave speed reduction units sequentially arranged in the vehicle advancing direction are calculated, and the geometric configuration parameters comprise the concave depth numerical value of each concave speed reduction unit and the distance numerical value between every two adjacent concave speed reduction units; the concave depth value obtained through calculation presents a gradually increasing trend in the vehicle advancing direction. According to the method, the concave speed reduction units with the gradually-increased depth and the gradually-decreased interval are configured through an algorithm, the overspeed vehicle is forced to decelerate through non-linear amplified composite vibration, and the control efficiency of road section speed limiting is improved.

The utility model relates to the field of bus getting-on and getting-off auxiliary devices, in particular to a barrier-free getting-on and getting-off auxiliary device. The getting-on and getting-off auxiliary device is arranged on the bottom side of a bus door, a lower bottom plate is arranged at the bottom of the getting-on and getting-off auxiliary device, a movable getting-on and getting-off plate is arranged on the lower bottom plate and can stretch out between an upper bottom plate and the lower bottom plate, a roller device is arranged in the middle of the getting-on and getting-off plate, and handrail devices are arranged on the two sides of the getting-on and getting-off plate. A baffle capable of being opened and closed is arranged on the outward extending part of the loading and unloading plate; a rotating device is arranged at the top of the getting-on and getting-off plate, three telescopic rods are arranged behind the rotating device, and the whole getting-on and getting-off auxiliary device is controlled to operate through a bus control center. The roller device can slowly rotate to provide getting-on assistance during getting-on, the wheelchair can conveniently get on and get off, the getting-off speed is slowed down under the action of a deceleration strip during getting-on and getting-off, safety is guaranteed, and the whole getting-on and getting-off plate can be rapidly erected and is convenient to install.

The application provides a speed bump energy absorption working condition recognition method and system, and relates to the technical field of intelligent transportation systems.The method collects vehicle weight, speed and vertical acceleration data in real time through a laser radar and a load cell, constructs a full-quantity feature data set, first calculates kinetic energy change and vertical impact energy, and after the cumulative energy reaches a threshold, stores the speed and acceleration data before and after the speed bump according to vehicle weight, performs Fourier transform on the acceleration data, extracts the low-frequency energy proportion, and constructs a quadratic regression model combined with the speed before and after the speed bump to predict the speed after passing through.The energy proportion abnormal threshold is set by statistical stratification of the mean and standard deviation of the energy proportion database, and when the low-frequency energy proportion of a new vehicle is lower than the energy proportion abnormal threshold and the speed prediction error is greater than or equal to 15%, it is determined that the energy absorption structure fails, and the dynamic monitoring and accurate diagnosis of the health state of the speed bump are realized.

1. The name of this design product: Speed bump (U-shaped groove). 2. Purpose of this design product: U-shaped groove speed bump used to slow down vehicles on the road. 3. The key design point of this design product lies in the combination of shape and pattern. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

The utility model provides a temporary deceleration strip for road construction, which relates to the field of deceleration strips and comprises a plurality of deceleration strip components, each deceleration strip component is provided with two through holes penetrating through two ends, a long rod is arranged in each through hole in a penetrating manner, and two ends of each long rod are provided with threads. And threads at the two ends of the long rod are in threaded fit with a first threaded cylinder and a second threaded cylinder, one end of the first threaded cylinder is fixedly connected with a clamping ring, and one end of the second threaded cylinder is fixedly connected with a fixing block. According to the temporary deceleration strip for road construction, through the arrangement of the long rod, during installation, the deceleration strip assembly is arranged on the long rod in a penetrating mode, then the first threaded cylinders are screwed at the two ends of the long rod till clamping rings at one ends of the first threaded cylinders abut against the deceleration strip assembly, then the second threaded cylinders are screwed at the end of the long rod, and the assembled deceleration strip assembly is laid on a road; after the fixing pin penetrates through the inserting hole in the fixing block from top to bottom, the knocking plate is knocked by a hammer, so that the fixing pin is inserted into the ground.

A vehicle kinetic energy recovery and passive detection deceleration strip based on a friction nanometer generator comprises a left slope section and a right slope section which are symmetrically arranged, the paper-based friction nanometer generator is arranged on the lower portion of a space between the left slope section and the right slope section, a cover plate is sealed on the upper portion of the space, and the paper-based friction nanometer generator is connected with an energy conversion system and a control unit. The upper surface of the right slope section is an inclined plane, a return device is arranged on the left side of a bolt hole of the right slope section, the left end of the cover plate is rotatably connected with the right end of the left slope section, the right end of the cover plate is pressed above the return device, and the left side of the return device is connected with a horizontal pressing plate which is located on the upper surface of the paper-based friction nanometer generator below the cover plate. The cover plate can downwards press the return device to the position below the upper surface of the right slope section under the action of heavy pressure, and due to the design of the novel cover plate and the return device, the cover plate does not integrally descend any more but is changed into single-side height reduction, so that impact on an automobile due to vertical movement of the cover plate can be better relieved when the automobile passes through the cover plate.

A control system for controlling vehicle speed to navigate a speed bump comprises controllers configured to receive speed bump information from a geographic information system indicative of a position

The invention relates to the technical field of deceleration hillocks, and discloses a stable deceleration hillock and a pavement process of the deceleration hillock, the stable deceleration hillock comprises a plurality of frameworks, asphalt layers are arranged outside the frameworks, and the plurality of frameworks and the asphalt layers outside the frameworks can be spliced to form the deceleration hillock; the framework is hollow, a separation assembly is arranged in the framework, the separation assembly comprises two separation rods, and the two separation rods are used for separating the joint of an asphalt layer and a road surface; the separation assembly comprises a jacking mechanism; butt joint mechanisms are arranged at the two ends of the framework. The deceleration hill can be formed by splicing the multiple frameworks and the asphalt layers outside the frameworks, the whole asphalt layers are firmly bonded to the road surface through the bonding materials in the four square grooves in the bottoms of the asphalt layers, stable installation of the asphalt layers is achieved, and compared with a conventional mode that fasteners are knocked into the road surface for installation, damage to the road surface is effectively avoided.

The utility model relates to the technical field of deceleration strips, and discloses a municipal deceleration strip which comprises a road surface and a deceleration strip body installed on the road surface, installation grooves are formed in the two sides of the surface of the deceleration strip body, installation screws are arranged on the surfaces of the installation grooves, and the deceleration strip body can be installed on the surface of the road surface through the installation screws. A plurality of gutter channels are formed in the surface of the deceleration strip body, and a dredging mechanism capable of dredging the gutter channels is arranged on one side of the surface of the deceleration strip body; when the deceleration strip is used, the two sides of the deceleration strip body can be communicated under the action of the gutter channel in rainy days, so that rainwater is prevented from being gathered on one side, the use safety of the deceleration strip body is improved, in addition, if the gutter channel is blocked by silt, a worker can dredge the gutter channel by using the dredging mechanism, and the working efficiency is improved. The working efficiency of dredging the gutter channel by workers is improved, and invalid workers can find proper tools again.

The utility model provides an intelligent pedestrian traffic passing device which comprises two mounting racks, a mounting base, a speed bump and a pressure sensor, the upper ends of the two mounting racks are both provided with rain shelters, the left and right sides of the lower ends in the two rain shelters are both provided with pedestrian detectors in a suspended mode, the mounting base is mounted on the left side of a zebra crossing through bolts, and the pressure sensor is mounted on the mounting base. Spring limiting frames are fixed to the left end and the right end of the interior of the mounting base, a plurality of reset springs are mounted in the two spring limiting frames at equal intervals from front to back, and the design solves the problems that in an original device, when an automobile passes through a deceleration strip, no pedestrian exists, traffic lights can be turned on, then the automobile waits for no reason, and time of people in the automobile is wasted; the traffic light is good in practicability, when an automobile passes through the deceleration strip, the pedestrian detector scans the zebra crossing, if no pedestrian is scanned, the traffic light is normally closed, so that the automobile can drive away conveniently, and if the pedestrian is scanned, the traffic light is turned on for timing, so that the pedestrian can walk conveniently.

A portable speed bump assembly includes a dolly and a spool that is rotatably attached to the dolly. A speed bump unit is rolled around the spool and the speed bump unit is played outwardly from the spool when the spool is rotated in a second direction to laid the speed bump unit across a roadway. The speed bump unit compels traffic on the roadway to slow down while driving over the speed bump unit thereby reducing the average speed of the traffic. The speed bump unit is rolled around the spool when the spool is rotated in the first direction for storing the speed bump unit. A drive unit is attached to the dolly and the drive unit is in mechanical communication with the spool for rotating the spool in either the first direction or the second direction.