California · Vehicle Code
VEH §21658: Whenever any roadway has been divided into two or more clearly marked lanes for traffic in one direction, the following rules apply: (a) A vehicle shall be driven as nearly as practical entirely withi
DUI / Traffic
Subsections
VEH §21658(a) — Lane straddling / unsafe lane change
Driving across lane markings or changing lanes unsafely is prohibited. Violations are minor traffic offenses.
Read the full statutory text
Whenever any roadway has been divided into two or more clearly marked lanes for traffic in one direction, the following rules apply: (a) A vehicle shall be driven as nearly as practical entirely within a single lane and shall not be moved from the lane until such movement can be made with reasonable safety. (b) Official signs may be erected directing slow-moving traffic to use a designated lane or allocating specified lanes to traffic moving in the same direction, and drivers of vehicles shall obey the directions of the traffic device.
Verify at the official source: California legislative text
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