Whenever any roadway has been divided into three (3) or more clearly marked lanes for traffic, or whenever any one-way street or roadway has been divided into two (2) or more clearly marked lanes for traffic, the following rules, in addition to all others consistent herewith, shall apply:

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

    (2)    Upon a roadway which is divided into three (3) lanes, a vehicle shall not be driven in the center lane, except when overtaking and passing another vehicle or cycle when the roadway ahead is clearly visible and such center lane is clear of traffic within a safe distance, or in preparation for a left turn where such center lane is at the time allocated exclusively to traffic moving in the direction in which the vehicle is proceeding and there is a sign posted to give notice of such allocation.

    (3)    Upon all highways any vehicle proceeding at less than the normal speed of traffic thereon shall be driven in the right-hand lane for traffic or as close as practicable to the right-hand edge or curb, except as otherwise provided in this chapter.

    (4)    Official signs may be erected or the city traffic engineer may place temporary signs directing slow moving traffic to use a designated lane or allocating a specified lane to traffic moving in the same direction. The drivers of vehicles shall obey the directions of every such sign.

    (5)    Drivers of vehicles proceeding in opposite directions shall pass each other to the right, and except when a roadway has been divided into traffic lanes, each driver shall give to the other at least one-half of the main traveled portion of the roadway whenever possible.

(Code 1964, § 12.294(E))