Texas has no statewide vehicle idling rule, but Dallas County is part of the Dallas-Fort Worth ozone nonattainment area where TCEQ Rule 30 TAC 114.512 limits heavy-duty diesel idling to five minutes. Dallas enforces this through air-quality coordination with TCEQ.
Vehicles weighing over 14,000 pounds operating in Dallas County may not idle longer than five consecutive minutes under TCEQ Rule 30 TAC Chapter 114, Subchapter J, Division 2. The rule applies to commercial trucks, buses, and similar heavy diesel vehicles in the DFW ozone nonattainment counties. Exceptions include traffic-related stops, mandated rest periods with sleeper berths during extreme temperatures, emergency vehicles, and active loading or unloading. Dallas itself has no separate municipal idling ordinance, relying on TCEQ enforcement and Dallas Office of Environmental Quality and Sustainability outreach. Local police may refer suspected violations to TCEQ regional offices, and fines can reach $500 per violation under Texas Health and Safety Code Section 382.085.
TCEQ administrative penalties may reach hundreds of dollars per idling violation. Repeat or willful violations of Texas Health and Safety Code Section 382.085 can escalate to civil enforcement actions seeking higher fines.
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