TY  - JOUR
PY  - 2017//
TI  - A multi-hierarchical strategy for on-ramp coordination
JO  - International journal of intelligent transportation systems research
A1  - Jiang, Rui
A1  - Lee, Jinwoo (Brian)
A1  - Chung, Edward
SP  - 50
EP  - 62
VL  - 15
IS  - 1
N2  - 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>
LA  - en
SN  - 1348-8503
UR  - http://dx.doi.org/10.1007/s13177-015-0120-9
ID  - ref1
ER  -