ABSTRACT:
This work designs a two-level strategy at signalized intersections
for preventing incident-based urban traffic congestion by adopting additional
traffic warning lights. The first-level one is a ban signal strategy that is
used to stop the traffic flow driving toward some directions, and the
second-level one is a warning signal strategy that gives traffic flow a
recommendation of not driving to some directions. As a visual and mathematical formalism
for modeling discrete-event dynamic systems, timed Petri nets are utilized to
describe the cooperation between traffic lights and warning lights, and then
verify their correctness. A two-way rectangular grid network is modeled via a
cell
transmission model. The effectiveness of the proposed
two-level strategy is evaluated through simulations in the grid network. The results
reveal the influences of some major parameters, such as the route-changing
rates of vehicles, operation time interval of the proposed strategy, and
traffic density of the traffic network on a congestion dissipation process. The
results can be used to improve the state of the art in preventing urban road
traffic congestion caused by incidents.
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