Säker framkomlighet: spårutveckling på mitträfflade, mötesfria och riktningsseparerade vägar

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Susanne Gustafsson
Peter Andrén

In this project, rut depth development studies were carried out on road sections subjected to three specific types of traffic safety measure. The measures, implemented through the Swedish Transport Administration’s "Safe accessibility" project, included

  1. milled centre-line rumble strips
  2. narrow 2+1 roads with median barrier
  3. divided roads (painted 2+1 roads with median rumble strips)

The introduction of centre-line rumble strips and barrier separation can result in traffic confinement and cause a reduction in the amount of vehicle lateral wander. This reduction is likely to increase the rate of rutting.

The purpose of this study was to investigate how annual rut development rates and rut area measurements – on conventional 2-lane roads with milled centre-line rumble strips, narrow barrier separated roads and divided roads – were affected by the introduction of these safety measures. With regards to centre-line rumble strips and comparisons between the test and control sections, results indicated that there were sometimes differences in the rut development rates. However, these differences were usually very small and inconsistent. The conclusions that can be drawn from the results are that centre-line rumble strips do not have a confining effect on traffic and have no adverse effect on the rate of rutting.

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