Results from a survey of fleet experience with spray-suppressant systems for mudguarding show that water-spraying absorbent materials can loose their efficiency after a year's service. Concern with safety was the main reason for trying to reduce spray. Other reasons were a desire to improve the public image, to keep vehicles cleaner and reduce dirt deposits on mirrors. Rear-wheel fitments accounted for the majority of experiments, nearly half of which were to trailers. Although none of the arrangements were entirely satisfactory, the best results were produced by those with their mudflaps closest to the ground, at an average height of only 3 1/2 inches. However, it was found that low flaps were vulnerable to damage from kerbs. The average distance of valences from the edge of the tyre was 1 1/2 inches -much less than the present 5 inch allowed by the present British standard. More recent tests suggest that vortexes pick up spray from water displaced sideways by the tyres and water dripping from the edges of the valences. It was reported that textured flaps clogged and were eventually no more efficient than a plain flap. (TRRL)

  • Availability:
  • Corporate Authors:

    Institute of Road Transport Engineeers

    1 Cromwell Place
    London SW1 25F,   England 
  • Publication Date: 1984-7

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 9
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00391210
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jan 30 1985 12:00AM