Michigan Compiled Laws
300-1949-VI-DRIVING-ON-RIGHT-SIDE-OF-ROADWAY—OVERTAKING-AND-PASS - Driving on Right Side of Roadway—overtaking and Passing, Etc. (257.634...257.646)
Section 257.642 - Roadway Divided Into 2 or More Marked Lanes; Applicable Rules; Designation as Hov Lane; Restrictions; Exceptions; Designation as Automated Vehicle Roadway or Lane; Violation as Civil Infraction.

Sec. 642.
(1) When a roadway has been divided into 2 or more clearly marked lanes for traffic, the following rules in addition to all other rules that are consistent with this act apply:
(a) A vehicle must be driven as nearly as practicable entirely within a single lane and must not be moved from the lane until the operator has first ascertained that the movement can be made with safety. On a roadway with 4 or more lanes that provides for 2-way movement of traffic, a vehicle must be operated within the extreme right-hand lane except when overtaking and passing, but must not cross the center line of the roadway except where making a left turn.
(b) On a roadway that is divided into 3 lanes and provides for 2-way movement of traffic, a vehicle must not be operated 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 a left turn, or where the center lane is at the time allocated exclusively to traffic moving in the same direction the vehicle is proceeding and the allocation is designated by official traffic control devices.
(c) Official traffic control devices may be erected directing specified traffic to use a designated lane or designating those lanes to be used by traffic moving in a particular direction regardless of the center of the roadway and operators of vehicles shall obey the directions of the traffic-control device.
(d) Official traffic-control devices may be installed prohibiting the changing of lanes on sections of roadway, and operators of vehicles shall obey the directions of the traffic-control devices.
(2) When any lane has been designated as an HOV lane under section 1 of 1951 PA 51, MCL 247.651, and has been appropriately marked with signs and pavement markings, the lane must be reserved during the periods indicated for the exclusive use of buses and HOVs. The restrictions imposed on HOV lanes do not apply to any of the following:
(a) Authorized emergency vehicles.
(b) Law enforcement vehicles.
(c) Transit buses operated by a regional transit authority created under the regional transit authority act, 2012 PA 387, MCL 124.541 to 124.558.
(3) When a segment of roadway has been designated as an automated vehicle roadway or a lane or ramp of an automated vehicle roadway as an automated vehicle roadway lane under section 665c, both of the following must apply:
(a) If a user fee is required under section 665c(1)(c), the user fee is paid.
(b) The motor vehicle or automated motor vehicle complies with any applicable requirements of section 665c(2).
(4) The requirements of subsection (3) apply in addition to other existing rules or regulations governing the use of an automated vehicle roadway or automated vehicle roadway lane that are not inconsistent with subsection (3).
(5) A person who violates this section is responsible for a civil infraction and may be fined as provided in section 907.
History: 1949, Act 300, Eff. Sept. 23, 1949 ;-- Am. 1974, Act 289, Imd. Eff. Oct. 15, 1974 ;-- Am. 1978, Act 510, Eff. Aug. 1, 1979 ;-- Am. 2008, Act 304, Imd. Eff. Dec. 9, 2008 ;-- Am. 2012, Act 498, Eff. Mar. 28, 2013 ;-- Am. 2022, Act 179, Imd. Eff. July 25, 2022