You just got a letter that says you were cited for "failure to maintain lane" after a crash or traffic stop. That usually means an officer, insurer, or court believes your vehicle moved out of its lane when it should have stayed there. On the road, it covers drifting, weaving, or crossing lane markings without safely changing lanes or without a valid reason, such as avoiding an obstacle. Sometimes it is a momentary lapse; sometimes it points to distraction, fatigue, speed, or slick pavement doing what slick pavement does.

Practically, the phrase matters because it can support a traffic ticket, raise insurance costs, and become key evidence in deciding fault. In Michigan, lane-use rules are tied to the Michigan Vehicle Code, including MCL 257.642, which requires driving as nearly as practicable within a single lane and not moving from that lane until the movement can be made safely. On I-75 or during a whiteout squall off Lake Michigan, that "as nearly as practicable" language can matter a lot.

For an injury claim, a lane violation can help show negligence, but it does not end the analysis by itself. Drivers may argue black ice, mechanical failure, or another vehicle forced the movement. In Michigan no-fault cases, fault still matters for vehicle damage and for pain-and-suffering claims under MCL 500.3135, where the injured person must meet the serious impairment of body function threshold.