Leaving of Ignition Keys in a Parked Auto.
Milwaukee Code of Ordinances § 101-30
in effect101-30. Leaving of Ignition Keys in a Parked Auto.
1. LOCK REQUIRED. Every passenger motor vehicle except a common carrier of passengers is required to be equipped with a lock suitable to lock either the starting lever, throttle, steering apparatus, gear shift lever, brake system or ignition system.
2. ON PUBLIC STREET. No person may permit a motor vehicle in his custody to stand or remain unattended on any street, alley or in any other public place, except an attended parking area, unless either the starting lever, throttle, steering apparatus, gear shift, brake system or ignition of said vehicle is locked and the key for such lock is removed from the vehicle. This subsection shall not apply to motor trucks when the engine must be kept running while the truck is standing or parked in order to provide power for auxiliary devices, appliances, accessories or machinery that are or is related to nondriving occupational operations, provided that the operator of the motor truck is in the near vicinity of the truck engaged in assigned or related duties while the engine is running, and further provided that the vehicle must be equipped with positive neutral position brake locks plus a safety override, or similar appropriate safety features.
Source: City of Milwaukee Legislative Reference Bureau, Milwaukee City Charter and Code of Ordinances (city.milwaukee.gov master PDFs)URL: https://city.milwaukee.gov/ImageLibrary/Groups/ccClerk/Ordinances/Volume-1/CH101.pdf#page=37Fetched: 10/26/2026