Traffic Simulation Velocity Calculation via Road Density
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Solution Overview
Problem
Current traffic simulation systems face divergence from reality due to the use of road models divided into blocks, which increases calculation time and reduces simulation accuracy, especially when modeling real-world scenarios.
Innovation Solution
A traffic simulation system that calculates vehicle velocities based on road density rather than individual vehicle velocities, reducing calculation time and improving simulation accuracy by using a judging unit, calculating unit, and setting unit to determine and set velocities for entering vehicles based on road density, and incorporating a cross-lane-turn judging and determining unit to assess turn possibilities using density and velocity data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If microscopic methods are used to separately track individual vehicle behaviors, then simulation accuracy is improved, but calculation time increases
Solution Approach 1:
The patent segments the road system into multiple blocks and processes vehicle movements block-by-block rather than tracking every individual vehicle throughout the entire system. This segmentation allows the simulation to maintain microscopic-level accuracy within each block while reducing overall computational complexity by processing smaller subsets of vehicles in sequence.
2Productivity
If road models are divided into blocks to improve simulation speed, then calculation time is reduced, but divergence from reality increases
Solution Approach 1:
The patent applies local quality by maintaining high-fidelity microscopic tracking within each road block while using macroscopic approaches for inter-block transitions. This allows the simulation to preserve accuracy in critical local areas (individual road segments) while achieving faster overall computation through the block-based structure.
Data Source
AI summary
In a traffic simulation in which vehicle models, which simulate vehicles, are moved in a road system model including links, which simulate the smallest segment of roads divided by intersections, etc., and nodes, which simulate the intersections, turning points of the roads, etc., the presence/absence of an entering vehicle model that enters a different link from a link in the road system model via the node is judged; the velocity of the entering vehicle model after entering the different link is calculated on the basis of the density of the vehicle models in the different link after the entering vehicle model has entered the different link; and the calculated velocity is set only for the entering vehicle model that has entered the different link.