(a) The weight limitations of § 621.101 do not apply to an emergency vehicle.
(b) The weight of an emergency vehicle may not exceed the greater of:
(1) the manufacturer’s gross vehicle weight capacity or axle design rating; or
(2) including all enforcement tolerances, a:
(A) gross weight of 86,000 pounds;
(B) single steering axle weight of 24,000 pounds;
(C) single drive axle weight of 33,500 pounds;
(D) tandem axle weight of 62,000 pounds; or
(E) tandem rear drive steer axle weight of 52,000 pounds.

(c) In this section, “emergency vehicle” means a vehicle designed to be used under emergency conditions:
(1) to transport personnel and equipment; and
(2) to support the suppression of fires and mitigation of other hazardous situations.