Okla. Stat. tit. 47, § 47-14-109.3: Exemption for vehicles fueled by compressed or

liquefied natural gas

A. A motor vehicle, if operated by an engine fueled wholly or

partially by compressed or liquefied natural gas, 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 the natural gas

tank and 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 also to interstate highways per the exemption

expressly permitted under section 127(s) of Title 23 of the United

States Code, as amended by Section 1410 of the Fixing America's

Surface Transportation Act of 2015.