Whenever any street or highway has been divided into clearly marked lanes for traffic, drivers of vehicles shall obey the following provisions:

A.    A vehicle shall normally be driven in the lane nearest the right-hand edge or curb of the street or highway when the lane is available for travel except when overtaking another vehicle or in preparation for a left turn as permitted in subsection D of this section.

B.    A vehicle shall be driven as nearly as is practicable entirely within a single lane and shall not be moved from a lane until the driver has first ascertained that such movement can be made with safety.

C.    Upon a street or highway which is divided into three lanes, a vehicle shall not be driven in the center lane except when overtaking and passing another vehicle or in preparation for a left turn, or unless such center lane is at the time allocated exclusively to traffic moving in the direction the vehicle is proceeding and is sign-posted to give notice of such allocation.

D.    The public works director may designate right-hand lanes for slow moving traffic and inside lanes for traffic moving at the speed indicated, and when such lanes are sign-posted or marked to give notice of such designation a vehicle may be driven in any lane allocated to traffic moving in the direction such vehicle is proceeding, but when traveling within such inside lanes vehicles shall be driven at approximately the maximum speed authorized in such lanes, and speed shall not unnecessarily be decreased so as to block, hinder or retard traffic.

(Ord. 713 § 93, 1968: 1962 Code § 35.290.)