Staying In Your Lane
Idaho Code § 49-637 — within a single lane, and out of it only once the move is safe
As nearly as practicable. On a road marked into two or more lanes, a vehicle is driven as nearly as practicable entirely within a single lane, and not moved from it until the driver has first made sure the move can be made safely.
On a three-lane road with two-way traffic, the center lane is used only to pass when it is clear, to prepare for a left turn, or where signs give it to one direction. Drivers obey signs that assign lanes or forbid changing them.
Whether drifting over a line justified a particular stop is a question the courts decide on the facts, and for a licensed Idaho attorney.
Sources for this section (1)
- Idaho Code § 49-637 — Driving on highways laned for traffic
Legal information, not legal advice. Verified as of October 2026. Applying it to a particular situation is the work of a licensed Idaho attorney.