Busway Crossing Warning System for Signal Priority
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Solution Overview
Problem
Traffic signals and blocked intersections often hinder buses and emergency vehicles from maintaining their schedule by causing delays, as existing systems lack an efficient method for these vehicles to activate traffic signals and pass through intersections without delay.
Innovation Solution
A busway crossing warning system that includes an approach tag reader in the bus lane, which detects buses equipped with identification tags and sends signals to a crossing controller to activate traffic signals and warning devices, ensuring buses and emergency vehicles can pass through intersections without stopping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traffic signals are used to control intersection traffic, then safety is improved, but buses and emergency vehicles experience delays and cannot maintain schedules
Solution Approach 1:
The approach tag reader is positioned upstream of the intersection to detect buses before they arrive. The system activates warning devices and prepares signal priority in advance, allowing buses to pass through without stopping while maintaining safety through pre-coordinated control actions.
Solution Approach 2:
The system continuously monitors bus approach through tag readers and provides real-time feedback to the crossing controller. This feedback loop enables dynamic adjustment of traffic signals and warning devices based on actual bus presence, ensuring schedule maintenance while preserving intersection safety.
2Reliability
If traffic signals are activated for all vehicles, then safety is improved, but buses cannot pass through intersections without stopping
Solution Approach 1:
The system applies different control treatments to different vehicles: buses equipped with tags receive priority treatment with activated warning devices and signal preference, while other vehicles receive standard traffic signal control. This localized differentiation allows buses to pass efficiently while maintaining overall intersection safety.
Solution Approach 2:
The tag reader system serves multiple functions: it identifies buses, triggers warning devices, coordinates traffic signals, and provides feedback to the control system. This multi-functionality enables the system to prioritize buses while maintaining standard safety protocols for all vehicles.
3Reliability
If warning devices are activated for all approaching vehicles, then safety is improved, but the system becomes overly complex and costly
Solution Approach 1:
The system extracts the warning device activation function specifically for buses, separating it from general traffic control. Only buses with identification tags trigger the warning devices and priority signal treatment, while other vehicles follow standard traffic signal procedures, reducing overall system complexity.
Solution Approach 2:
The tag reader acts as an intermediary that selectively identifies buses and triggers the warning device activation sequence. This intermediary component simplifies the system by providing automatic vehicle classification, eliminating the need for complex manual or universal warning systems.
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 prioritizes bus and emergency vehicle traffic, ensuring timely passage through intersections by activating traffic signals and warning devices only for tagged vehicles, thereby maintaining schedule integrity and ensuring safety.
Implementation Method 1
The approach tag reader is configured to detect the bus with the identification tag when the bus drives over the approach tag reader
Data Source
AI summary
A busway crossing warning system includes an approach tag reader, a crossing controller and a bus signal device. The approach tag reader is located in a bus lane on a road at a distance from an entrance of an intersection in a direction prior to a bus approaching the intersection, the bus being equipped with an identification tag. The approach tag reader detects the bus with the identification tag when the bus drives over the approach tag reader and sends out an approach signal to the crossing controller indicating the bus is approaching the intersection. The crossing controller activates bus signal device after receiving the approach signal to inform the bus is detected.