A driver commits this violation by moving out of a marked lane without staying as nearly as practical in that lane or without making sure the movement can be done safely.

On the street, that usually means drifting onto the shoulder, crossing a lane line, clipping into the next lane during a turn, or wandering between lanes because of distraction, fatigue, speed, or impairment. In Texas, tickets for this often tie back to Texas Transportation Code § 545.060, Driving on Roadway Laned for Traffic. It is not always about a dramatic swerve; even a brief lane drift can be enough if it creates a safety problem or leads to a stop or crash. On long, empty stretches like I-10 in west Texas, tired driving and high-speed lane drift are common factors.

For an injury claim, a lane violation can become key evidence of negligence. Police reports, dashcam video, skid marks, vehicle damage, and witness statements may help show who left their lane first and whether the move was unsafe. That can affect liability, insurance negotiations, and whether the other side argues you were partly at fault under Texas proportionate responsibility rules.

If this shows up after a crash, get the report, save photos, and document exactly where each vehicle was. A vague story hurts; lane-position evidence helps. In truck and oil field traffic, that detail can make or break the claim.