A Pilot Study of the Relationship between Macrotexture and Crash Occurrence

  • Published: ARRB Transport Research, 2005
  • Authors: P. Cairney and E. Styles
  • Date Added: 06 Mar 2013
  • Last Update: 06 Mar 2013
  • Format: pdf


To establish the relationship between macrotexture and RTIs.


A pilot study of the relationship between macrotexture and RTIs was undertaken by locating each RTI on the macrotexture measurement record.

Key Findings:

  • Macrotexture is generally believed to affect braking through the two mechanisms of hysteresis and the prevention of a water film.

  • A literature review concluded that RTI risk is greater at sites with low macrotexture, but studies differ as to the macrotexture values at which risk begins to increase.

  • In nearly all cases, there was an association between macrotexture and RTIs.

  • There was a significant association between low macrotexture and RTIs at all rural intersection sites, but no association between low macrotexture and wet road RTIs, nor between macrotexture and young driver cashes.

  • There was insufficient data to do formal testing for heavy vehicle involvement, but the pattern of the data suggests that low macrotexture was underrepresented at the sites of RTIs involving heavy vehicles.

  • The results agree with previous studies regarding the increase in risk with low macrotexture.


Surface texture, RTIs


Australian-based research but relevant to UK.