1991•Transportation Research Record Journal of the Transportation Research BoardRequires access

EXAMINATION OF THE SPEED-FLOW RELATIONSHIP AT THE CALDECOTT TUNNEL

Hoong Chor Chin, Adolf D May

Abstract

Recently, a new procedure for analyzing multilane highways was proposed, together with a set of speed-flow curves that were rather different from those in the Highway Capacity Manual (HCM). Consideration is given to whether a freeway basic section treated as a multilane divided highway section with no access points can be analyzed using this procedure. The speed and flow characteristics of a freeway section (California State Highway 24) at the Caldecott Tunnel are examined and compared with the speed-flow curves in the HCM for freeways and those in the new procedure for multilane highways. The problems associated with traffic data gathering, reduction, and analysis are also reviewed. It was found that the new procedure reflects the speed-flow characteristics at the Caldecott Tunnel better than the HCM procedure for freeways.

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Key concepts: Transport engineering, Traffic flow (computer networking), Highway Capacity Manual, Flow (mathematics), Section (typography), Traffic speed, Engineering, Set (abstract data type)