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:


Austin-Round Rock MSA (Central Texas) Heavy Duty Motor Vehicle Idling Limitations

Report HDV Idling and have a positive impact on air pollution in Central Texas.

  • If you see a parked heavy duty diesel truck, van or bus with its engine running for more than 5 consecutive minutes anywhere in Bastrop, Caldwell, Hays, Travis and Williamson counties, write down its license number, as well as the date, time and location of the occurrence.
Report the vehicle by submitting the online form here or by calling 512-343-SMOG (7664) within 30 days. Reporting is free, and you do not have to give your name.

Local governments in the 5-county Austin-Round Rock metropolitan statistical area (MSA) have agreed to implement the state rule for idling of heavy duty vehicles (HDV).  The rule limits HDV idling to 5 minutes year-round, with several
exceptions in which the rule does not apply.  

By signing a Memorandm of Agreement (MOA) with the Texas Commission on Environmental Quality (TCEQ), the following local governments have committed to implementing HDV Idling rules:

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