A person may not open a door of a motor vehicle unless it is reasonably safe to do so without interfering with the movement of other traffic. A person may not leave a door open on a side of a vehicle adjacent to moving traffic for a period of time longer than is necessary to load or unload passengers.
Mont. Code Ann. § 61-8-368
Opening and closing vehicle doors
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.