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CAPACITY AND TRAFFIC CHARACTERISTICS AT A FREEWAY WORK ZONE IN FINLAND

A Enberg, M S Mannan

Abstract

This paper deals with traffic flow characteristics and capacity of a work zone on one of the main freeways in southern Finland. The speed limit was 50 km/h. Point measurements with portable Hi-Star Counters and car following studies using an instrumented vehicle were done. The speed level at the work zone was 30-65 km/h in the morning peak towards east and 35-65 km/h in the evening peak towards west. The spacing between the leading vehicle and the following vehicle varied between 5 and 30 m and the mode was about 12 m. The space mean speeds were found to be a little lower than the speed limit in peak hour traffic but higher than the speed limit in normal traffic. The calculated capacity was 1,636 veh/h for the basic lane and 1,828 veh/h for the passing lane and 1,828 veh/h for the passing lane towards east.

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Key concepts: Speed limit, Traffic flow (computer networking), Work zone, Work (physics), Morning, Meteorology, Evening, Limit (mathematics)