RFID Traffic Sign Transmits Speed Limits to Vehicles
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Solution Overview
Problem
Existing traffic signs require active driver attention to convey speed limit information, which can be missed due to distractions or obstructions, especially on high-speed roads where signs are visible for a brief duration.
Innovation Solution
Implementing RFID tags along roads to transmit traffic information, including speed limits, to vehicle-mounted receivers, which can also use non-visible polarized light reflectors to convey information, ensuring drivers receive relevant and prioritized traffic updates without relying solely on visual signs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional visual traffic signs are used, then drivers can see speed limit information, but drivers may miss the signs due to distractions, obstructions, or brief visibility on high-speed roads
Solution Approach 1:
The patent introduces RFID tags as an intermediary medium between the traffic sign and the driver. The RFID tag transmits speed limit information wirelessly to a receiver in the vehicle, serving as a mediator that delivers information reliably even when visual signs are missed due to driver distraction or obstruction.
Solution Approach 2:
The patent replaces the purely mechanical visual sign system with an electromagnetic communication system. Instead of relying on drivers to visually perceive and process information from static signs, the system uses RFID electromagnetic waves to transmit information automatically to the vehicle's receiver, eliminating the need for active visual attention.
2Speed
If visual traffic signs are used on high-speed roads, then speed limit information can be conveyed, but the signs are visible only briefly reducing driver reaction time
Solution Approach 1:
The RFID tag continuously transmits speed limit information to the vehicle receiver before the driver needs to react. This preliminary transmission of information allows the driver to be alerted to speed limits in advance, providing sufficient reaction time even when traveling at high speeds where visual signs are briefly visible.
3Ease of manufacture
If passive visual traffic signs are used, then infrastructure cost is low, but driver attention is required which can be compromised by distractions
Solution Approach 1:
The RFID-based system provides self-service information delivery without requiring active driver engagement. The system automatically transmits speed limit information to the vehicle receiver without needing the driver to visually process or actively attend to the signs, eliminating the attention requirement while maintaining infrastructure simplicity.
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
Enhances driver awareness and safety by providing continuous and prioritized traffic information, reducing the risk of missing speed limits, especially in dynamic or obstructed conditions, through passive and active RFID systems and non-visible light reflectors.
Implementation Method 1
Each speed limit can be associated with a priority, and high priority speed limits can be implemented with mobile traffic signs as necessary, overriding regular priority speed limits. Other traffic information can also be provided.
Implementation Method 2
The polarization of the road reflector can convey traffic information. The sensor module can be in communication with a vehicle-mounted display, wherein the display displays information selected from received traffic information based on priority.
Implementation Method 3
a non-visible light source for projecting a non-visible light beam and a sensor module for sensing a reflected polarized reflection
Data Source
AI summary
An improved traffic sign is discussed. The traffic sign includes road reflectors, which reflect available light towards a driver indicating road lane divisions. A sensor module coupled with a vehicle can convert the reflected light to a binary word. The sensor module can further convert the binary word into traffic information, wherein a vehicle-mounted display displays information selected from received traffic information based on priority, time of receipt, and relevance. The improved traffic sign can also include an RFID tag configured to transmit traffic information to a vehicle-mounted receiver.