Texas drivers warming up their cars on chilly mornings may be breaking state law if they leave the engine running while the vehicle is unattended.
Under Texas Transportation Code §545.404, drivers must stop the engine, remove the key, and lock the ignition before walking away, whether the car is in a driveway, outside a home, or parked at a store.
The rule is designed to prevent thefts and reduce safety risks, especially during colder months when “puffing” — leaving a car idling to warm up — becomes more common. Police departments across the state routinely warn drivers that unattended idling vehicles are frequent targets for quick, opportunistic thefts.
There is one key exception: vehicles equipped with a remote-start system may legally idle because the engine can run without the key being in the ignition. Law enforcement vehicles also fall under specific exemptions outlined in the statute.
Texas authorities say the requirement is enforced year-round, but cold weather often brings a spike in violations. Drivers looking to avoid a citation or theft are encouraged to use remote start if available or stay with their vehicle until it’s ready to go.
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