HB40 Alabama 2018 Session

Updated Feb 26, 2026

Notable

Summary

Primary Sponsor: Kyle South
Republican
Session: Regular Session 2018
Title: Gas, natural gas, conversion of motor vehicles for operating on compressed natural or liquefied gas, extended weight allowances, Sec. 32-9-20 am'd.
Summary: HB 40 would allow longer and heavier vehicles for certain motor vehicles by changing length rules and adding weight allowances for natural gas conversions and idle-reduction technology.
What This Bill Does
It amends Alabama's size-and-weight rules to adjust length limits for some vehicles. It permits heavier weights for vehicles with conversion equipment that lets them run on compressed natural gas or compressed liquefied gas, up to a maximum gross weight of 82,000 pounds on interstate highways, based on the difference between the natural gas system and a diesel system. It also adds a 400-pound allowance to weight limits for vehicles using a certified idle-reduction auxiliary power unit, if the unit is functioning, with proof required. Enforcement would follow existing tolerance rules and verification methods used by law enforcement and transportation officials.

Who It Affects
Trucking operators and fleets that use or plan to use natural gas–fueled engines or conversion equipment, who could carry heavier loads and/or travel with longer vehicle lengths on certain highways.
Vehicle operators using idle-reduction auxiliary power units (APUs), who could add up to 400 pounds to weight limits if the APU is certified and functioning.

Key Provisions
Provides for length adjustments for certain vehicles as part of the size and weight restrictions update.
Allows a natural gas–fueled vehicle to exceed standard weight limits up to 82,000 pounds gross weight on interstate highways, by the difference in weight between the natural gas tank/fueling system and a diesel tank/fueling system, for EPA-certified engines or conversion units.
Adds a 400-pound weight allowance for vehicles using a functioning auxiliary power unit to reduce idling, contingent on certification and proof of weight.
Specifies that these allowances apply under enforcement rules and tolerances, including verification methods such as portable and platform scales.

AI-generated summary using openai/gpt-5-nano on Feb 24, 2026. May contain errors — refer to the official bill text for accuracy.
Subjects: Alternative Fuels