Vehicle Idling Restrictions: Phoenix vs Tempe

Does the rule apply to my passenger car?

No. Maricopa Rule 322 applies only to diesel vehicles over 14,000 pounds gross vehicle weight. Passenger cars and light trucks are exempt, though Phoenix urges voluntary idling reduction during ozone high-pollution advisory days.

Can a delivery truck idle while loading?

Only for the active load or unload period or up to five minutes per hour, whichever applies. Idling solely for driver comfort beyond that window violates Rule 322 and exposes the carrier to citation.

Are sleeper berths exempt?

Sleeper-berth idling is allowed during federally required rest periods when ambient temperatures fall below 40 or exceed 75 Fahrenheit, matching federal hours-of-service safety standards for driver health.

Does Rule 322 apply to my pickup truck or RV?

Generally no. The rule covers heavy-duty diesel vehicles over fourteen thousand pounds GVWR. Most personal pickups, RVs, and light-duty trucks fall below the threshold, though local nuisance ordinances may still apply.

Can a truck idle while running refrigeration?

If a separate auxiliary power unit or transport refrigeration unit runs the reefer, yes. If the main engine powers the refrigeration directly, the five-minute cap applies unless an MCAQD-approved technology or another listed exemption is in use.