Bus Warning System Using Focused Light Zones
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Solution Overview
Problem
Existing warning systems for vulnerable road users, such as cyclists and pedestrians, are inadequate in preventing collisions and accidents, particularly around bus stops where passengers exiting buses may collide with passing cyclists or cross the road unsafely.
Innovation Solution
A warning system mounted on buses that uses strategically positioned lights with focusing lenses to define safe and forbidden zones through illuminated lines and symbols, activated by predefined conditions such as door status and vehicle speed, to guide vulnerable users and prevent accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing warning systems (sensing devices, audible/visual warning devices) are used, then vulnerable road users can be detected and warned, but the systems are inadequate in preventing collisions and accidents around bus stops
Solution Approach 1:
The patent uses different colors of light (red, yellow, green) to indicate different safety zones and warning levels. The light source changes color based on the distance and relative motion of the cyclist, providing intuitive visual information about danger levels and guiding appropriate passenger behavior without requiring complex electronic displays or multiple separate devices.
Solution Approach 2:
The patent adds a spatial dimension to warning systems by projecting illuminated patterns (circles, lines, zones) onto the ground surface. This creates a visual map of safe and dangerous areas that passengers can see and respond to, transforming abstract distance measurements into concrete spatial guidance that is immediately understandable.
2Illumination intensity
If lights are positioned to illuminate large areas, then vulnerable road users can see warning zones clearly, but the amount of light required increases energy consumption
Solution Approach 1:
The patent illuminates specific local areas (danger zones, safe zones, stop lines) rather than uniformly lighting entire regions. The light is concentrated where it is most needed - on the ground surface at critical locations near the bus - providing maximum visual impact with minimum energy expenditure by avoiding unnecessary illumination of surrounding areas.
Solution Approach 2:
The light source operates in periodic cycles, switching between different colors (red, yellow, green) and illumination patterns based on the detected situation. This periodic operation allows the system to provide comprehensive warning information over time while reducing average power consumption compared to continuous high-intensity illumination of all areas simultaneously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively warns vulnerable road users of potential dangers, reducing the likelihood of accidents by guiding them to stay within safe zones and avoiding forbidden areas, thereby enhancing their safety around buses.
Implementation Method 1
The warning system comprises a light source, a focusing lens arranged between the light source and the ground surface to focus the light from the light source in such a way that one or more lines or symbols are formed by the focused light on the ground surface
Data Source
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AI summary
A warning system is disclosed to be mounted on or incorporated in a vehicle, such as a bus, for warning vulnerable road users, such as cyclists and pedestrians, said warning system comprising one or more lights arranged to be mounted on or incorporated in one side of the vehicle, the front end of the vehicle, the back end of the vehicle, or any combination thereof for illuminating at least a part of the surface of an area along the side of the vehicle, along the front of the vehicle, along the back of the vehicle, or any combination thereof, and a control system arranged to switch the one or more lights on and off, respectively, in accordance with a set of predefined conditions, wherein said one or more lights are arranged to define one or more zones on said at least a part of the surface illuminated by said one or more lights, said one or more zones being associated with a recommended behaviour for vulnerable road users. Furthermore, a vehicle comprising such a warning system, a method of retrofitting vehicles with such a warning system, and a method of warning vulnerable road users using such a warning system are disclosed.