Various traffic management strategies have been developed to alleviate the congestion on freeways. The equity issue has been considered as one of the major challenges for the implementation of some traffic control strategies, especially ramp metering. This paper presents a comparative evaluation of the efficiency and equity performance of a traffic control strategies namely Fixed Time Ramp Metering (FTRM). Instead of focusing on a single equity measure and/or indicator, different approaches to the equity concept are discussed and various equity measures are examined. The equity and efficiency performance of traffic control strategies are compared and evaluated by incorporating them into the simulated corridor. The Bosporus Bridge of Istanbul O-1 Freeway, Turkey is used as a test-bed for the simulation model and the control strategy is employed through microscopic traffic flow simulation software, VISSIM AG. The findings from the simulations show that the equity and efficiency properties of the network vary with the measures and indicators taken into account. The results also suggest that the trade-off between equity and efficiency can be observed for some measures, whereas regarding to other measures the trade-off is not validated.

No abstract

ABSTRACT

No abstract

In this study, dynamic ramp metering approach has been applied on Levent ramp of Istanbul Outer Beltway (0-2) on which Fatih Sultan Mehmet (FSM) Bridge is located. In this context, field measurements at the related highway intersection have been obtained from highway authority in order to determine the pattern of the traffic, which fluctuates all day long. The most important output of the study is to test the ALINEA control mechanism, which may smooth the traffic flow on 0-2. The algorithm has been implemented in PTV VISSIM microscopic traffic simulation environment. Obtained results have shown that even a standalone dynamic ramp metering process can be alleviated the traffic congestion on an urban highway sufficiently.