@article{ref1,
title="A multi-hierarchical strategy for on-ramp coordination",
journal="International journal of intelligent transportation systems research",
year="2017",
author="Jiang, Rui and Lee, Jinwoo (Brian) and Chung, Edward",
volume="15",
number="1",
pages="50-62",
abstract="Ramp metering (RM) is an access control for motorways, in which a traffic signal is placed at on-ramps to regulate the rate of vehicles entering the motorway and thus to preserve the motorway capacity. In general, RM algorithms fall into two categories by their effective scope: local control and coordinated control. Local control algorithm determines the metering rate based on the traffic condition on adjacent motorway mainline and the on-ramp. Conversely, coordinated RM strategies make use of measurements from the entire motorway network to operate individual ramp signals for optimal performance at the network level. This study proposes a multi-hierarchical strategy for on-ramp coordination. The strategy is structured in two layers. At the higher layer, a centralised, predictive controller plans the coordination control within a long update interval based on the location of high-risk breakdown flow. At the lower layer, reactive controllers determine the metering rates of those ramps involved in the ramp coordination with a short update interval. This strategy is modelled and applied to the northbound model of the Pacific Motorway in a micro-simulation platform (AIMSUN). The simulation results show that the proposed strategy effectively delays the onset of congestion and reduces total congestion with better managed on-ramp queues.<p /> <p>Language: en</p>",
language="en",
issn="1348-8503",
doi="10.1007/s13177-015-0120-9",
url="http://dx.doi.org/10.1007/s13177-015-0120-9"
}