Okla. Stat. tit. 47, § 47-14-109.4: Exemption for vehicles fueled by electricity or

hydrogen.

A. A motor vehicle or a commercial motor vehicle, if operated

by an engine fueled wholly or partially by an electric battery or

hydrogen fuel cell electric fueling system, may exceed the gross

vehicle weight limits and any axle weight limits by an amount, not

to exceed a maximum of two thousand (2,000) pounds, that is equal to

the difference between:

1. The weight of the vehicle attributable to electric batteries

or hydrogen fuel cell electric fueling system carried by that

vehicle; and

2. The weight of a comparable diesel tank and fueling system.

B. The weight exemption allowed under this section shall extend

to all state roads and highways; however, vehicles operating

pursuant to the provisions of this section shall only be allowed to

operate on the National System of Interstate and Defense Highways

with a federal exemption.