Yellow Trap Detection in Traffic Signal Malfunction Management

Solution Overview

Problem

Conventional malfunction management units (MMUs) in traffic control systems are unable to effectively detect the 'yellow trap' sequence, which can lead to unsafe situations for left-turning drivers due to mis-programming or unskilled technician errors, resulting in potential accidents.

Innovation Solution

A malfunction management unit with a yellow trap detection module that monitors the sequence of intersection phases and determines whether a yellow trap sequence has occurred, capable of instructing the traffic intersection to enter an emergency mode or alarm condition to prevent unsafe situations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional MMUs are used to monitor traffic signals, then basic malfunction detection is provided, but yellow trap sequences cannot be detected

Engineering Contradiction:

Improvedetection capabilityVSAvoidsequence recognition capability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The MMU is divided into functional modules: an input/output module for receiving signal states and a yellow trap detection module for analyzing sequences. This segmentation allows the system to specialize in detecting specific hazardous patterns while maintaining overall reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system pre-defines hazardous signal sequences (yellow trap patterns) in its detection logic. By having these sequences predetermined and built into the detection algorithm, the MMU can immediately recognize and alert operators to dangerous patterns without requiring complex real-time analysis.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If leading/lagging protected/permissive left turns are implemented to increase left turn capacity, then intersection efficiency is improved, but yellow trap sequences may occur

Engineering Contradiction:

Improveleft turn capacityVSAvoidyellow trap hazard

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The MMU continuously monitors the actual signal sequence and provides feedback to operators when a yellow trap pattern is detected. This feedback mechanism allows the system to maintain efficient leading/lagging left turn operations while alerting operators to hazardous sequences that may have been inadvertently programmed, enabling corrective action.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The MMU acts as an intermediary safety layer between the traffic controller programming and the actual traffic signals. It independently verifies that the programmed sequences do not create yellow trap hazards, providing an additional check that prevents hazardous patterns from being implemented even when they increase left turn capacity.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If unskilled technicians program traffic controllers, then installation flexibility is improved, but programming errors creating yellow traps increase

Engineering Contradiction:

Improveprogramming accessibilityVSAvoidprogramming accuracy

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The system pre-defines hazardous signal sequences (yellow trap patterns) in its detection logic. By having these sequences predetermined and built into the detection algorithm, the MMU can immediately recognize and alert operators to dangerous patterns without requiring complex real-time analysis.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The MMU continuously monitors the actual signal sequence and provides feedback to operators when a yellow trap pattern is detected. This feedback mechanism allows the system to maintain efficient leading/lagging left turn operations while alerting operators to hazardous sequences that may have been inadvertently programmed, enabling corrective action.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS9460620B2Systems and methods for detecting yellow trap sequences

Publication Date: 2016.10.04 POLARA ENTERPRISES LLC

AI summary

A malfunction management unit includes an input/output module communicatively coupled to a controller. The input/output module is configured to monitor a sequence of intersection phases determined by the controller. A yellow trap detection module communicatively coupled to the input/output module is configured to determine whether a yellow trap sequence has occurred within the sequence of intersection phases. The yellow trap sequence may comprise a first state followed by a second state, the first state corresponding to permissive left turns in both a first direction and a second, opposing direction, and the second state corresponding to a protected left turn in the first direction.