Citation

Zhang SR, Tang GX. J. Traffic Transp. Eng. (Xi'an, Shaanxi) 2006; 6(4): 101-104.

Affiliation

School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

Copyright

(Copyright © 2006, Chang'an Daxue)

DOI

unavailable

PMID

unavailable

Abstract

In order to ensure the safe, expedite and comfortable operation of freeway mainline, and to lessen its influence on linked roads, a fuzzy logic controller of on-ramp was constructed, three kinds of auxiliary on-ramp projects were designed. In practical engineering, the upstream density, downstream density and entrance queue of vehicle-flux were selected as controller inputs, the metering rate of on-ramp was selected as controller output. Calculated result indicates that downstream vehicle speeds in mainline are decreasing obviously with the increasing of vehicle number in on-ramp; according to upstream density, downstream density and vehicle number, ramp metering rate can be calculated; the entrance of on-ramp vehicles can be controlled by the real-time adjusting of the metering rate of freeway on-ramp, the application of auxiliary projects can alleviate the congestion of linked roads, and improve the safety and efficiency of freeway running.

Language: en