What trips people up most is that a driver does not have to blow through an intersection at full speed to get cited. Rolling past the white line, failing to stop before a crosswalk, or stopping too far forward can still count if the vehicle never makes a complete stop where the law requires.

Running a stop sign means failing to come to a full stop at a posted stop sign before entering an intersection, crosswalk, or the proper stopping point. A full stop means the vehicle's movement actually ends, even for a moment. After stopping, the driver still has to yield the right-of-way to other vehicles, cyclists, and pedestrians before proceeding. In Montana, this is governed by Montana Code Annotated § 61-8-346 (2023), which requires stopping at clearly marked stop lines, before crosswalks, or before entering the intersecting roadway.

Practically, this matters because a stop-sign violation can be strong evidence of negligence after a crash. If someone is hit in an intersection, the driver who failed to stop may be found at fault, which can affect insurance decisions, citations, and any personal injury claim.

In Montana, that can become especially serious on mountain roads near passes off I-90 or where spring flooding has damaged bridge approaches and visibility. Even if weather, mud, or road washout played a part, failing to stop can still be used to argue a driver did not use reasonable care.