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SURFACE DRESSING OF GRAVEL ROADS. TRAFFIC AND FRICTION SURVEYS

YTBEHANDLING AV GRUSVAGAR. TRAFIK-OCH FRIKTIONSSTUDIER

In the spring of 1976, the Swedish Road Administration, for test purposes, arranged for the surface dressing of about 100 km of gravel roads with a new, inexpensive coating called Y1G. No improvements was made in the cross-section, alignment of sight distances of the roads. The present report accounts for the results of traffic surveys and friction measurements undertaken before, and after, the surfaces dressing was made. The measurements were carried out in order to provide a basis for the evaluation of how the surface dressing affected the traffic safety. The investigation demonstrated that the surface dressing resulted in: An increase of the coefficient of friction of the road surface by 0,1-0,3; An increase of the median speed by 1,5-3,5 km/h, and a slightly lesser increase in the speeds lying above the median speed; An stimated reduction of the stopping distances by 0.15%; Reduced or unchanged utilization of friction in horizontal courves; No clear change of the estimated possibilities of evasive actions in connection with meeting other vehicles on hilltops with blocked sight distances. The results refer to passenger cars and dry summer roadway conditions. The conclusion which may be drawn from that study is that the surface dressing should not have impaired traffic safety. The results rather indicate a certain degree of improvement. The results also point to the importance of utilizing the whole width of the gravel road as extensively as possible for the surface dressing. /Author/

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 73 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00168406
  • Record Type: Publication
  • Report/Paper Numbers: Report No. 119
  • Files: TRIS
  • Created Date: Feb 16 1978 12:00AM