State law file · verified June 2026
Maryland idling law: the 5 minutes rule
A motor vehicle engine may not run more than 5 consecutive minutes while the vehicle is not in motion (Transportation §22-402), with exceptions for traffic, mechanical trouble, heating/cooling and auxiliary equipment, warm-up to the manufacturer’s recommended temperature, and the vehicle’s intended use.
Exceptions that actually matter
- Traffic conditions or mechanical difficulties
- Operating heating, cooling, or auxiliary equipment
- Warming the vehicle to the manufacturer’s recommended operating temperature
- Idling needed to accomplish the vehicle’s intended use
Penalties
Violations are cited under the Maryland vehicle code. The sources we can verify don’t state a fixed idling fine schedule, so we don’t quote one — Maryland enforcement materials and the statute text are linked below.
Who enforces it — and how to report
Police enforcement under the vehicle code; the Maryland Department of the Environment promotes idle-reduction programs.
Persistent commercial idling can be raised with local police or the Maryland Department of the Environment; there is no citizen reward.
Can you get paid for reporting in Maryland?
No. Maryland has no citizen reward — complaints are civic, not paid. The only major program that pays complainants is New York City's idling bounty, where citizens keep 25% of collected fines and our enforcement data shows what that produces: hundreds of thousands of cases and an estimated eight-figure sum paid to filers. If a paid program launches in Maryland, this page will say so.
Frequently asked questions
Is idling illegal in Maryland?
Yes — Transportation §22-402 bars running a stationary vehicle’s engine more than 5 consecutive minutes, with exceptions including traffic, warm-up, and auxiliary equipment.
Does Maryland pay you for reporting idling?
No. Reports go to local police or MDE with no reward share. Only NYC pays complainants — 25% of collected fines.
Sources
This summary was checked against the following official sources on the date shown above. Laws change — verify before relying on specifics.
- Md. Code, Transportation §22-402 — statute (Justia)
- US DOE AFDC — Maryland idle reduction requirement
Other state law files
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General legal information, not legal advice. Statutes and penalty schedules summarized from the sources above as of June 2026.