Idaho § 49-637 - Driving on highways laned for traffic
Full text of Idaho Idaho Statutes § 49-637 — Driving on highways laned for traffic, with citation guidance and answers to common questions.
§ 49-637. Driving on highways laned for traffic
Whenever any highway has been divided into two (2) or more clearly marked lanes for traffic the following, in addition to all else, shall apply:
(1) A vehicle shall be driven as nearly as practicable entirely within a single lane and shall not be moved from that lane until the driver has first ascertained that the movement can be made with safety.
(2) Upon a highway which is divided into three (3) lanes and provides for two-way movement of traffic, a vehicle shall not be driven in the center lane except when overtaking and passing another vehicle traveling in the same direction when the center lane is clear of traffic within a safe distance, or in preparation for making a left-turn or where the center lane is at the time allocated exclusively to traffic moving in the same direction that the vehicle is proceeding and the allocation is designated by a traffic-control device.
(3) Traffic-control devices may be erected directing specified traffic to use a designated lane, or designate those lanes to be used by traffic moving in a particular direction, regardless of the center of the highway and drivers of vehicles shall obey the directions of every device.
(4) Traffic-control devices may be installed prohibiting the changing of lanes on sections of highways and drivers of vehicles shall obey the directions of every device.
[49-637, added 1988, ch. 265, sec. 166, p. 663.]
Source: official Idaho text · Last verified 2026-08-27
Frequently Asked Questions About Idaho § 49-637
What does Idaho Statutes § 49-637 cover?
Section 49-637 ("Driving on highways laned for traffic") is part of the Idaho Statutes, the codified statutory law of Idaho. It sets out the legal rule or procedure described in the text above. Statutes are amended regularly, so always verify against the official source.
How do I cite Idaho § 49-637?
A common citation format is "Idaho Statutes § 49-637" (Idaho). Legal writing may require the code abbreviation, section number, and year or edition. Match the style required by your court, professor, or publisher.
Is this the official text of Idaho law?
No. This page is for research and education and may not include the most recent amendments. For official current law, check the Idaho official source linked on this page or consult a licensed Idaho attorney.
How does Idaho § 49-637 apply to my situation?
Statutes are interpreted in context, and application depends on your specific facts. Only a licensed attorney in Idaho can advise on how this section applies to you. Contact your state or local bar association for a referral.
Sources & Verification
Not legal advice. Verify against the official source and consult a licensed attorney in Idaho.