Pre-YELLOW Phase Traffic Signal Wireless Warning System
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Solution Overview
Problem
Actuated traffic signal controls face challenges in providing timely information to vehicles about impending phase changes, especially from GREEN to YELLOW, due to unpredictable transitions and lack of deterministic vehicle detection, leading to safety concerns and inefficient traffic management.
Innovation Solution
The implementation of a 'Pre-YELLOW' phase, wirelessly transmitted from the traffic control computer to vehicles, which extends the GREEN phase with a countdown, allowing vehicles to anticipate and prepare for the upcoming signal change, thereby enhancing driver warning systems and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If actuated traffic signal controls are used to manage traffic flow dynamically, then traffic efficiency is improved, but timely information provision to vehicles about phase changes deteriorates due to unpredictable transitions
Solution Approach 1:
The system performs preliminary action by transmitting a pre-yellow phase warning to vehicles before the actual yellow phase begins. This advance notification allows drivers to prepare for the upcoming phase change, resolving the information timing issue while maintaining the dynamic actuated control benefits
2Device complexity
If traditional traffic signal phases are used without early warning, then system complexity is minimized, but driver safety deteriorates due to reduced response time
Solution Approach 1:
The traditional single yellow phase is segmented into two distinct phases: a pre-yellow warning phase transmitted to vehicles, and the actual yellow phase displayed at the intersection. This segmentation enhances driver safety by providing advance notice while maintaining relatively simple system architecture
3Device complexity
If phase change information is transmitted later, then synchronization requirements are simplified, but collision risk increases due to reduced driver response time
Solution Approach 1:
The system transmits phase change information in advance during a pre-yellow phase, performing the information delivery action before the actual phase change occurs. This preliminary information provision gives drivers adequate response time to react safely, reducing collision risk while maintaining manageable synchronization requirements
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
This solution improves driver safety by providing early warnings and reducing the 'Dilemma Zone' by extending the visible YELLOW phase, ensuring vehicles can react to impending changes before the traditional YELLOW phase is indicated, thus enhancing traffic control and management at actuated intersections.
Implementation Method 1
A message indicating the pre-YELLOW phase and a phase time is wirelessly transmitted
Data Source
AI summary
A roadside equipment (RSE) system that can be used for controlling traffic signals and other equipment and corresponding method. A method includes maintaining a traffic signal in a GREEN phase in a first direction, including displaying a GREEN indicator in the first direction. The method includes detecting an event indicating that the phase of the traffic signal in the first direction should be changed and changing the phase of the traffic signal to a pre-YELLOW phase in response to the detected event, including continuing to display the GREEN indicator in the first direction. The method includes wirelessly transmitting a message indicating the pre-YELLOW phase and a phase time, the phase time indicating a next change of phase of the traffic signal, and changing the phase of the traffic signal to a YELLOW phase when the phase time has been reached.