Harmonization with Variable Speed Limits on Motorways
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, 2016, 664-675 p.Conference paper (Refereed)
This paper presents an investigation and a state-of-the-art description of traffic effects of harmonization with variable speed limits. Expansion of the E4 south of Stockholm has been carried out during the years 2009-2013. The expansion includes a rearranged lane configuration within the existing road section (25 m) and traffic management systems. Previous design with two lanes and hard shoulder has been replaced with three lanes without shoulder. In addition, the road has been equipped with variable speed limits (with red ring); queue warning system with recommended speed (without red ring) and emergency refuge areas (ERAs). The queue warning functionality was activated in 2011 and harmonization in 2013. Reduced speed variance is an important goal for the traffic management system and is considered to both reduce rearend collisions and the risk of capacity breakdown. German experience shows that harmonization affects capacity down to about 80 kph. English experience is that the harmonization and monitoring can reduce accidents by 40 % at normal speed of 70 mph (112 kph). Germany and England decrease the speed with approximately 20 kph at the degree of saturation of 0.7 to let the flow be harmonized before the traffic density has increased too much. Two different models of harmonization have been developed and one of them implemented on the E4 south of Stockholm. The model in field-tests has been iteratively designed and ultimately set to 325 vehicles/5 min across all lanes, with speed limit is reduced to 80 kph, which has worked well.
Place, publisher, year, edition, pages
Elsevier, 2016. 664-675 p.
, Transportation Research Procedia, ISSN 2352-1465 ; 15
Harmonization, Variable Speed Limits, Motorway, Capacity
Transport Systems and Logistics
IdentifiersURN: urn:nbn:se:kth:diva-197833DOI: 10.1016/j.trpro.2016.06.056ISI: 000387262700056OAI: oai:DiVA.org:kth-197833DiVA: diva2:1059626
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, JUN 14-16, 2016, Berlin, GERMANY
QC 201612222016-12-222016-12-082016-12-22Bibliographically approved