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2+1-roads Recent Swedish Capacity and Level-of-Service Experience
Swedish Transport Adm, Sweden; Movea Trafikkonsult, Sweden.
Swedish Transport Adm, Sweden.
Swedish National Rd and Transport Research Institute, Linköping, Sweden.
Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, Faculty of Science & Engineering. Swedish National Road and Transport Research Institute, Linköping, Sweden.ORCID iD: 0000-0002-0336-6943
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2016 (English)In: INTERNATIONAL SYMPOSIUM ON ENHANCING HIGHWAY PERFORMANCE (ISEHP), (7TH INTERNATIONAL SYMPOSIUM ON HIGHWAY CAPACITY AND QUALITY OF SERVICE, 3RD INTERNATIONAL SYMPOSIUM ON FREEWAY AND TOLLWAY OPERATIONS), ELSEVIER SCIENCE BV , 2016, Vol. 15, p. 331-345Conference paper, Published paper (Refereed)
Abstract [en]

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. AADTs 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 drivers 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 SCIENCE BV , 2016. Vol. 15, p. 331-345
Series
Transportation Research Procedia, ISSN 2352-1465
Keywords [en]
2+1 median barrier roads; capacity; level of service
National Category
Transport Systems and Logistics
Identifiers
URN: urn:nbn:se:liu:diva-133132DOI: 10.1016/j.trpro.2016.06.028ISI: 000387262700028OAI: oai:DiVA.org:liu-133132DiVA, id: diva2:1055227
Conference
International Symposium on Enhancing Highway Performance (ISEHP) / 7th International Symposium on Highway Capacity and Quality of Service / 3rd International Symposium on Freeway and Tollway Operations
Available from: 2016-12-12 Created: 2016-12-09 Last updated: 2016-12-29

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Olstam, Johan
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CiteExportLink to record
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