40 CFR § 1037.527
Aerodynamic measurements for vocational vehicles
June 9, 2020
This section describes a methodology for determining aerodynamic drag area, CdA, for use in determining input values for vocational vehicles as described in §1037.520. This measurement is optional.
(a) Determine ΔCdA values by performing A to B testing as described for trailers in §1037.526, with any appropriate adjustments, consistent with good engineering judgment.
(b) [Reserved]