BS AU 200-1a:1984

Specifies three types of devices for reducing side spray emitted from the wheels of heavy goods vehicles. An appendix gives brief guidelines on aerodynamics.

This Part of BS AU 200 specifies requirements for devices which are fitted to motor vehicles and trailers for the purpose of controlling spray which is generated between the vehicle tyres and a wet road surface.

Requirements for containment and suppression devices in the form of “conventional” types of wheel guards with valances and wheel flaps for motor vehicles having a maximum gross mass exceeding 7.5 t, articulated tractor units having a train mass exceeding 7.5 t and trailers having a maximum gross mass exceeding 3.5 t are specified in section 2.

Requirements for containment and suppression devices which may be fitted as alternatives to the devices dealt with in section 2 when conventional types of wheel guards are not used, but the wheels are always covered by the floor of the vehicle body, are specified in section 3. Section 3 applies only to non-steerable rear wheels on single and multiple axles of motor vehicles having a maximum gross mass exceeding 7.5 t and to trailers having a maximum gross mass exceeding 3.5 t.

Alternative requirements for valances and wheel flaps for use on the containment devices dealt with in section 2 for the types of vehicle referred to in that section are specified in section 4.

NOTE 1 Appendix A contains general comment relating to aerodynamic styling.

NOTE 2 The title of the publication referred to in this standard is given on the inside back cover.