Relation between surface texture of roads and accidents

  • Published: TRL, 1991
  • Authors: P.G. Roe, D.C. Webster and G. West
  • Date Added: 06 Mar 2013
  • Last Update: 06 Mar 2013
  • Format: pdf


To determine High-Speed Texture Meter (HSTM) measurements on a wide range of roads which have been used to relate texture depth directly to RTIs.


SCRIM and HSTM surveys were performed on a network of roads and then compared with the RTI records for those roads.

Key Findings:

  • Both skidding and non-skidding RTIs, in both wet and dry conditions, are less if the macrotexture is course than if it is fine. This is observed at all levels of underlying skid resistance.

  • The texture level below which RTIs begin to increase is about 0.70 mm sensor measured texture depth.

  • All major types of surfacing contribute texture depths across the practical range.

  • Macrotexture has similar influence on RTIs if they occur near hazards such as junctions or elsewhere.

  • The study notes that further research is required to confirm the hypothesis that improving texture reduces RTIs – research since this report was produced, would suggest that this hypothesis has been confirmed.


Texture, RTI reduction


UK content but could be out of date now.


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