R909-2-7. Variable Load Axles

  (1) Vehicles with variable load axles are limited as follows:

  (a) no more than three fixed axles shall be allowed in any group;

  (b) retractable or variable load suspension axles installed after January 1990 shall be self-steering on power units or when augmenting a tridem group on trailers;

  (i) Non-divisible loads may be exempt from these restrictions upon written approval from the division.

  (c) no axle in a group with a retractable or VLS axle shall exceed legal or bridge formula weight requirements, or the manufacturer's tire rating; and

  (d) Controls for raising or lowering retractable or VLS axles may be located in the cab of the power unit. The pressure regulator valve shall be positioned outside of the cab and be inaccessible from the driver's compartment.