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原文传递 TRAFFIC FLOW CHARACTERISTICS ON A THREE-LANE RURAL HIGHWAY IN FINLAND: RESULTS FROM EMPIRICAL STUDIES AND SIMULATIONS.

题名：	TRAFFIC FLOW CHARACTERISTICS ON A THREE-LANE RURAL HIGHWAY IN FINLAND: RESULTS FROM EMPIRICAL STUDIES AND SIMULATIONS.
作者：	Enberg-A; Pursula-M
关键词：	TRAFFIC-FLOW-CHARACTERISTICS; THREE-LANE-HIGHWAYS; FINLAND-; PASSING-LANES; LENGTH-; BEFORE-AND-AFTER-STUDIES; FIELD-STUDIES; TRAFFIC-FLOW-SIMULATION; OVERTAKING-; TRAFFIC-SPEED; PLATOONING-; PLATOON-DISPERSION
摘要：	The traffic-flow characteristics on an experimental, 20-km-long three-lane highway section in Finland were studied. The sections of highway that have a separate passing lane consist of three lanes. The central lane is assigned alternately to each direction as a passing lane with a length of 1.05 to 1.70 km. The lengths of the no-overtaking zones between successive passing lanes are 1.5 to 4.0 km. The traffic-flow characteristics on the three-lane highway have been observed by comprehensive before-and-after field studies and complementary simulations. Because it was possible to use passing lanes, the number of overtakings on the three-lane highway was remarkably higher than on the former two-lane highway. The overall average travel speeds were slightly higher, and the speed decreased a little more slowly with increasing flow on the three-lane compared with the two-lane highway. Overall platooning and mean platoon lengths decreased as a result of platoon dispersal on the passing lanes. The speeds used in the passing lanes were clearly higher than in the basic lanes. According to the simulation results, the optimum length for a single passing lane was between 0.5 and 2.5 km depending on flow rate and measure of effectiveness. For the actual three-lane highway conditions, passing lanes 1.0 to 1.5 km long seemed to bring the most benefits.
总页数：	Transportation Research Record. 1997. (1572) pp33-42 (6 Fig., 15 Ref.)
报告类型：	科技报告