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

(a) A vehicle shall be driven as nearly as practical 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.

(b) 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 where 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 or where such center lane is at the time allocated exclusively to traffic moving in the direction the vehicle is proceeding and is signposted to give notice of such allocation.

(c) Official signs may be erected directing slow moving traffic to use a designated lane or allocating specified lanes to traffic moving in the same direction and drivers of vehicles

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shall obey the directions of every such sign.

SOURCE: GC § 23117.5, enacted by P.L. 3-016 (July 14, 1955).