15 C.F.R. § 265.19 Unattended vehicles.
Title 15 - Commerce and Foreign Trade
No person shall leave a motor vehicle unattended on the site with the engine running or a key in the ignition switch or the vehicle not effectively braked.
Title 15: Commerce and Foreign Trade
PART 265—REGULATIONS GOVERNING TRAFFIC AND CONDUCT ON THE GROUNDS OF THE NATIONAL INSTITUTE OF STANDARDS & TECHNOLOGY, GAITHERSBURG, MARYLAND, AND BOULDER AND FORT COLLINS, COLORADO
Subpart B—Traffic and Vehicular Regulations
§ 265.19 Unattended vehicles.