Traffic Signal Preemption Approach Map Creation
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Solution Overview
Problem
Existing traffic signal preemption systems require manual travel and data collection to create approach maps, making the process time-consuming and expensive, and limiting the efficiency of traffic signal preemption for emergency and transit vehicles.
Innovation Solution
A method and system for creating approach maps using a computer system to display road maps, allowing users to instantiate and configure graphical objects representing approach roads, determining location data, and storing it for traffic signal preemption controllers, enabling preemption initiation without physical travel to intersections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual travel and data collection methods are used to create approach maps, then the process can be completed with existing technology, but the process becomes time-consuming and expensive
Solution Approach 1:
The patent uses GPS trajectory data to create digital copies of the actual vehicle paths through intersections. Instead of manual measurement, the system captures and stores coordinate data that replicates the physical approach routes, enabling automated map generation that is both accurate and efficient
Solution Approach 2:
The patent replaces manual mechanical data collection methods with electronic GPS-based automated systems. The controller automatically captures location data from vehicles equipped with GPS receivers, substituting human-driven data gathering with automated electronic tracking and processing
2Ease of manufacture
If manual travel and data collection are used to create approach maps, then equipment costs can be controlled, but the process becomes expensive due to time consumption
Solution Approach 1:
The system enables vehicles to automatically record and transmit their own trajectory data to the controller without requiring external manual intervention. The GPS receiver in each vehicle self-captures location information, and the controller automatically processes this data to generate approach maps, making the system self-sufficient and highly efficient
Solution Approach 2:
The patent collects GPS trajectory data during normal vehicle operations before the approach maps are needed. This preliminary data collection occurs continuously as vehicles traverse the approaches, so when map creation is required, the data is already available, eliminating the need for dedicated manual survey trips
Data Source
AI summary
Methods and systems for creating an approach map for a traffic signal preemption controller. A road map is displayed, and in response to user input for instantiating a first segment of an approach map, a first instance of a graphical object overlaying one of the plurality of roads is displayed. The one road represents an approach road to an intersection having the preemption controller. First segment location data that describes a first geographical area bounded by the first segment are determined from size and placement of the first instance of the graphical object on the road map and from location data associated with the one road. The first segment location data are stored in association with the approach map for the preemption controller. The preemption controller, once configured with the first segment location data, initiates traffic signal preemption in response to a preemption request transmitted from within the first geographical area described by the first segment location data.