2+1-roads Recent Swedish Capacity and Level-of-Service Experience
2016 (English)In: Transportation Research Procedia, ISSN 2324-9935, E-ISSN 2352-1465, Vol. 15, 331-345 p.Article in journal (Refereed) Published
The first Swedish 2+1 median barrier road was opened in 1998. The concept was to retrofit the standard existing two-lane 13 m paved width cross-section at 90 and 110 kph posted speed limit without widening. This design has one continuous lane in each direction, a middle lane changing direction every one to three kilometres with a median barrier separating the two traffic directions. Today over 2 700 km 2+1 median barrier roads are opened for traffic. AADT’s vary from some 3 000 to 20 000 with an average just below 10 000 nowadays normally with 100 kph.
The concept has lately been enhanced also to cover the existing 9 m paved width cross-section. The design concept is the same from a driver’s viewpoint, one continuous lane in each direction with a middle lane changing direction and a separating median barrier. This is created by introducing a continuous median barrier and adding overtaking lanes within an overtaking strategy. The differences are the existence of 1+1-sections, less overtaking opportunities and a slightly more narrow cross-section. Some 15 projects are opened. The purpose of this paper is to summarize present knowledge on level-of-service issues as they are presented in Swedish design and assessment guidelines and to give an overview of field measurements and theoretical analytical and simulation studies supporting the recommendations.
Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 15, 331-345 p.
Highway design, Traffic lane, Level of service, Traffic flow, Overtaking, Simulation
Transport Systems and Logistics
Research subject 20 Road: Traffic engineering, 25 Road: Traffic theory; 20 Road: Traffic engineering, 21 Road: Traffic measurement and traffic analysis
IdentifiersURN: urn:nbn:se:vti:diva-10983DOI: 10.1016/j.trpro.2016.06.028OAI: oai:DiVA.org:vti-10983DiVA: diva2:1039077
International Symposium on Enhancing Highway Performance (ISEHP), June 14-16, 2016, Berlin — (7th International Symposium on Highway Capacity and Quality of Service, 3rd International Symposium on Freeway and Tollway Operations)
FunderTrenOp, Transport Research Environment with Novel PerspectivesSwedish Transport Administration