Hastighetsflödessamband för svenska typvägar: förslag till reviderade samband baserat på TMS-mätningar från 2009-2011

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Johan Olstam
Arne Carlsson
Mohammad Reza Yahya

This report presents suggestions for new speed-flow relationships for motorways (MV), low standard motorways (4F), oncoming lane separated highways with grade separated intersections (MML), oncoming lane separated highways with at grade intersections (MLV), and two-lane highways. The suggestions are based on measurements from Trafikverket’s traffic count measuring system TMS in combination with model calculations. The TMS data have, for each road category, been quality checked, processed and analyzed. The data material is presented as speed-flow graphs for personal cars, trucks/buses without trailers and trucks with trailers. A comparison of the current speed-flow relationships and the TMS measurements was then conducted for each road category. The revised set of relationships then constituted the base for the 2012 revision of Trafikverket's publication "Effect calculations for road facilities". The analysis conducted resulted in suggestions to decrease the free flow speed and the travel speed at higher flows for most of the road categories. For motorways also a decrease in capacity is suggested. For oncoming separated highways (both MML and MLV) are minor changes of the capacity suggested. The suggested capacity value is for MML and MLV 1550 vehicles/h independently of speed limit and lane/road width.

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