Nya V/D-funktioner på väg: preliminära funktioner för tätortsmiljöer baserade på ny metod
2007 (Swedish)Report (Other academic)Alternative title
New V/D-functions on the way. Preliminary functions for urban road environments based on a new method (English)
In this report a preliminary set of V/D-functions based on a new calibration method is presented. The proposed V/D-functions follow a road categorization based on road type, road environment, speed limit and number of lanes. The functions are divided into two parts, one that describes the link travel time and one that describes the intersection delay. The link travel time has been estimated from the Speed-Flow relationships presented in Vägverket (2001). The intersection delay is estimated from calculations with the analytical intersection model CAPCAL A practical computer program has been developed which makes it easy to estimate functions for the different road categories based on assumptions about turn shares, flow relations, intersection density, etc. The set of V/D-functions presented in this report is based on preliminary assumptions. It has within the frames of this project not been possible to test or validate the functions in any traffic assignment. Before the functions can be used for real applications, a last stage is needed which should include - Final choice of functional form - Quality assurance on the underlying assumptions - Final test and validation with a traffic assignment program.
Place, publisher, year, edition, pages
Linköping: VTI., VTI rapport 571 , 2007. , 38 p.
VTI rapport, ISSN 0347-6030
Traffic flow, Capacity, Journey time, Delay, Junction, Speed limit, Traffic lane, Analysis, Network, Mathematical model, Calibration
Research subject Road: Traffic engineering, Road: Traffic theory
IdentifiersURN: urn:nbn:se:vti:diva-6425OAI: oai:DiVA.org:vti-6425DiVA: diva2:675302