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Barrier separated road type design: accelerated degradation
Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.ORCID iD: 0000-0002-6198-0888
2017 (English)Report (Other academic)Alternative title
Mötesfria vägar : accelererad nedbrytning (Swedish)
Abstract [en]

To reduce the risk of vehicular head-on collisions, the Swedish Transport Administration (Trafikverket), has been transforming high traffic-volume conventional roads into barrier separated roads. This process has reduced the number of fatalities by around 80 percent.

However, evidence has shown that barrier separated roads degrade quicker than conventional road types.

The extent of the problem was quantified by comparing various sets of road surface characteristic data. Comparisons revealed that degradation levels increase by up to 60 percent in the single lane sections of 2+1 type barrier separated roads.

Vehicle position surveys were carried out and subsequent data analysis confirmed that confinement of vehicle lateral wander is a main cause of the problem. The analysis indicated that in the single lane section of a 2+1 type barrier separated road, vehicle lateral wander reduced by 24 percent for light vehicles and 19 percent for commercial traffic. These figures increased to 44 percent and 39 percent for a 1+1 type barrier separated road.

Accelerated degradation can be attributed to poor cross-sectional design. The amount of vehicular lateral wander is restricted and results in surface wear and loading being concentrated in narrow tracks along the road section.

Design improvements are possible but will obviously require higher initial investment expenditure.

Abstract [sv]

För att minska risken för frontalkrockar har Trafikverket omvandlat högt trafikerade traditionellt utformade vägar till mötesfria vägar. Denna omvandlingsprocess har minskat antalet dödsolyckor med ungefär 80 procent.

Dock har det visat sig att mötesfria vägar bryts ner snabbare än traditionellt utformade vägar.

Omfattningen av problemet har kvantifierats genom att jämföra olika datauppsättningar om vägytors karakteristiska egenskaper. Dessa jämförelser visade att spårdjupsutvecklingen ökade upp till 60 procent på de enfiliga sträckorna av mötesfria vägar som 2+1-vägar.

Undersökningar av fordonsposition utfördes också och en efterföljande analys bekräftade att inskränkning i fordonens sidolägesvariation utgjorde en väsentlig del av problemet. Analysen indikerade att på enfiliga sträckor av 2+1-vägar minskade sidoförflyttning med 24 procent bland lätta motorfordon och 19 procent bland tunga. Dessa siffor ökade till 44 procent respektive 39 procent för 1+1-vägar.

Accelererad nedbrytning uppstår på grund av dålig tvärsnittsdesign. Sidoförflyttning av fordon begränsas, vilket resulterar i slitage och att belastning koncentreras till smala spår längs med vägsträckan.

Designförbättringar är möjliga, men kräver större initiala investeringsinsatser.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2017. , 81 p.
Series
VTI rapport, ISSN 0347-6030 ; 925A
Identifiers
URN: urn:nbn:se:vti:diva-12025OAI: oai:DiVA.org:vti-12025DiVA: diva2:1133291
Available from: 2017-08-16 Created: 2017-08-15 Last updated: 2017-08-17Bibliographically approved

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