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The Journal of The Korea Institute of Intelligent Transport Systems Vol.24 No.6 pp.230-243
자율주행 혼재 시 도시부 정체 확산 완화를 위한 상류부 속도제어 정책 방향 연구
A Study on the Direction of the Upstream Speed Control Policy to Mitigate the Spread of Congestion in Urban Areas in Mixed Autonomous Driving
Abstract
This study examines an upstream speed-control strategy to mitigate chronic peak-period congestion and spillback propagation in urban corridors. Inspired by the motorsport Safety-Car concept, an upper speed limit is applied to a leading platoon of automated vehicles on upstream links. Using VISSIM, scenarios were designed for Market Penetration Rates (MPR = 0%, 25%, 50%, 75%, 100%), and their effects were evaluated through queue lengths and surrogate safety measures derived from the Surrogate Safety Assessment Model (SSAM). Results show that, at MPR levels of 75% and higher, spillback risk and queue lengths significantly decrease and queues become more longitudinally dispersed along the corridor. However, excessive deceleration partially offsets safety gains and increases variability, indicating a trade-off between stability and efficiency. The findings suggest that adaptive, real-time speed control in mixed traffic can enhance traffic management and safety even before full automation, providing a practical policy basis for early-stage autonomous driving environments.
