Traffic Evaluation Device Congestion Length Correction
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Solution Overview
Problem
Conventional traffic simulators face challenges in accurately reproducing actual traffic metrics due to difficulties in measuring vehicle behavior and OD traffic volume, leading to discrepancies between simulated and measured congestion lengths, which affects reproducibility and comparison of traffic conditions before and after evaluation.
Innovation Solution
A traffic evaluation device that generates and adjusts corrected start and arrival traffic volumes based on measured and estimated congestion lengths, allowing for comparison of traffic metrics before and after evaluation conditions are set, using an evaluation condition setting mechanism, congestion length estimation, and release/withdrawal processes to align simulated results with actual data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional traffic simulators use standard OD traffic volume and vehicle behavior parameters as input data, then the device complexity and ease of operation are maintained at acceptable levels, but the manufacturing precision (reproducibility of traffic metrics) deteriorates due to accumulated differences between simulated and actual traffic data
Solution Approach 1:
The patent applies preliminary action by calculating and storing corrected traffic volumes in advance for each time slot before evaluation conditions are set. These corrected volumes are pre-computed based on the relationship between measured and simulated congestion lengths, then stored for later use during evaluation scenarios, eliminating the need for real-time complex calculations during actual traffic evaluation
Solution Approach 2:
The patent introduces an intermediary corrected traffic volume as a mediator between the measured congestion length and the simulated traffic metrics. This corrected volume serves as a bridge that transfers the accuracy of measured data to the simulation without requiring direct complex interaction between measurement and simulation systems
2Manufacturing precision
If traffic simulators adjust parameters such as running speeds and outflow percentages to achieve reproducibility in particular routes, then the manufacturing precision improves for those specific links, but the device complexity increases and reproducibility deteriorates in downstream routes and intersections due to varying traffic circumstances
Solution Approach 1:
The patent applies segmentation by dividing the road network into individual links and processing each link independently. The correction is applied link-by-link based on measured congestion length for that specific link, rather than adjusting parameters globally across the entire network. This prevents cumulative effects from propagating to downstream routes
Solution Approach 2:
The patent implements local quality by applying corrections specifically to the traffic volume of each link based on its own measured congestion length, rather than using uniform parameter adjustments across the network. Each link receives a tailored correction based on local measurement data, maintaining adaptability across different routes and intersections
3Measurement precision
If traffic simulators use measured congestion length data for each link, then the measurement precision improves, but the difficulty of detecting and measuring increases due to the need for comprehensive data collection across the entire road network
Solution Approach 1:
The patent extracts only the essential congestion length measurement from complex vehicle behavior data. Instead of requiring detailed measurement of individual vehicle speeds, accelerations, and routing decisions, the system extracts solely the congestion length metric for each link, significantly reducing measurement difficulty while maintaining precision
Data Source
AI summary
This traffic simulator is provided with a simulator engine unit for performing computation on the basis of a formula representing a movement model for a vehicle, a traffic volume calculation unit for calculating a generated traffic volume and a removed traffic volume on the basis of a given OD traffic volume, an estimated congestion length calculation unit for calculating (estimating) an estimated congestion length for each link on the basis of the calculated traffic volume thereof, an origin and destination generation unit for generating an origin traffic volume and an destination traffic volume to adjust the estimated congestion length on the basis of the difference between the estimated congestion length and the measured congestion length, a storage unit for storing predetermined information, and an evaluation condition setting unit for setting evaluation conditions for evaluating the traffic various quantities metrics.