HDV Idling Documents and Links

    Memorandum of Agreement         (PDF)

    See also:  

Contact Information:

email: info@engineoff.org
phone: 512-343-SMOG (7664)

Engine off is a service of:


Frequently Asked Questions

  What is the Law?

Beginning August 2005, it became a violation of state law for operators of vehicles with a gross vehicle weight of more than 14,000 pounds to idle for over five minutes. In July 2011, enforcement was expanded to year-round.

Why is it important?

Unnecessary idling costs money, both in excess fuel consumption and in shortened engine life.   Idling emissions contribute to air pollution, which can cause adverse health effects.  U.S. EPA estimates that excess idling is responsible for: 

   Who’s affected by the regulation?

Drivers of motor vehicles weighing over 14,000 pounds operating in Bastrop, Caldwell, Hays, Travis and Williamson Counties are subject to the regulation, regardless of the state or county in which the vehicle is registered.  Businesses or property owners who allow or permit prohibited idling to occur on their property are also subject to the regulation.  Motor vehicles are defined as vehicles with an internal combustion engine and four or more wheels which can transport a person or property and which are required to be registered under Texas Transportation Code 502.002.  Vehicles in federal Vehicle Identification Number (VIN) gross vehicle weight classes 4,5,6,7 and 8 weigh over 14,000 pounds.

What are the penalties for noncompliance?

Local Jurisdictions in the five-county Austin-Round Rock region who have entered into an enforcement MOA with TCEQ agreed to impose penalties on violators if necessary to ensure compliance with the rule.  Inside city limits cities can either take violators directly to court and seek penalties of, or adopt a municipal ordinance and pursue appropriate enforcement remedies. Enforcement outside city limits will be conducted by counties.  Refer to each jurisdiction's implementation plan or contact your local jurisdiction for more specific information.

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