When may you cross a dashed white line to change lanes?
Correct answer: A – After verifying that the lane change can be made safely
Montana law requires a vehicle to remain within its lane until the driver has determined that moving from it can be done safely. A dashed white line separates traffic moving in the same direction and may be crossed for a safe lane change. Check surrounding traffic before moving and avoid interfering with its flow.
Source: MCA § 61-8-328(1) – Driving on Roadways Laned for Traffic, Montana Driver Manual — Ch. 3, “Pavement Markings—Edge and Lane Lines”, Montana Driver Manual — Ch. 4, “General Driving”



