Pennsylvania's Diesel-Powered Motor Vehicle Idling Act and Pittsburgh enforcement limit diesel truck and bus idling to five minutes per hour, with school-zone and residential adjacency restrictions enforced by Pittsburgh Police and ACHD.
PA Act 124 of 2008 (35 P.S. §4601 et seq.) limits diesel commercial vehicles over 10,001 pounds to five minutes of idling per continuous hour. Pittsburgh enforces this through Police and Allegheny County Health Department air-quality officers. Exemptions cover sleeper-berth heating below 40°F, traffic queuing, and engine maintenance. Construction sites near homes face additional ACHD enforcement. Repeat operators on city contracts may lose contracting privileges. Drivers must shut engines at loading docks longer than five minutes.
First-offense warnings followed by $150 fines; repeat violations $500 per occurrence under PA Act 124. ACHD pursues separate air-quality penalties on commercial operators.
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