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2 + 1-roads with cable barriers : A new safety measure Bergh, Torsten ; Carlsson, Arne ; Wennerström, Håkan

By: Contributor(s): Publication details: 2nd European road research conference, Brussels, 2004; 7-9 June 1999. Paper, Description: 6 sSubject(s): Bibl.nr: VTI 2000.0038Location: Abstract: The recently introduced Swedish traffic policy defines the Null-vision as a major objective; no one killed or severely injured in road traffic accidents. At the same time, the budget for interurban road investments has been substantially cut. Almost 100 people out of a total 400 on state roads are killed yearly on 13 m roads, still being the safest two lane road. The main problem on all two-lane roads is run-off and meeting accidents harvesting more than 50 % of all fatalities. The event process is the same. The driver looses control for some reason and crashes against some obstacle; in the roadside area or in the shape of an opposing unlucky driver. A full-scale development programme directed at low cost 2+1-cable barrier solutions for these existing 13 m roads has been started. An overview of preliminary empirical findings from the first opened project is presented and shows: - very difficult to promote in the political planning process for normal 13 m roads, - the cost of the 1.0 m hard strip and the full 1:6 design on two lane sections is not cost-effective. A more extensive use of side cable barriers is probably more feasible. - the traffic safety and behaviour performance has so far surpassed all expectations with no severe accidents as yet, - the negative impact on normal traffic conditions is less than anticipated. - the maintenance problems experienced so far are basically as expected. Repair frequencies for the cable barrier is higher. Snow ploughing and removal is also more costly than estimated.
Item type: Reports, conferences, monographs
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The recently introduced Swedish traffic policy defines the Null-vision as a major objective; no one killed or severely injured in road traffic accidents. At the same time, the budget for interurban road investments has been substantially cut. Almost 100 people out of a total 400 on state roads are killed yearly on 13 m roads, still being the safest two lane road. The main problem on all two-lane roads is run-off and meeting accidents harvesting more than 50 % of all fatalities. The event process is the same. The driver looses control for some reason and crashes against some obstacle; in the roadside area or in the shape of an opposing unlucky driver. A full-scale development programme directed at low cost 2+1-cable barrier solutions for these existing 13 m roads has been started. An overview of preliminary empirical findings from the first opened project is presented and shows: - very difficult to promote in the political planning process for normal 13 m roads, - the cost of the 1.0 m hard strip and the full 1:6 design on two lane sections is not cost-effective. A more extensive use of side cable barriers is probably more feasible. - the traffic safety and behaviour performance has so far surpassed all expectations with no severe accidents as yet, - the negative impact on normal traffic conditions is less than anticipated. - the maintenance problems experienced so far are basically as expected. Repair frequencies for the cable barrier is higher. Snow ploughing and removal is also more costly than estimated.

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