(A) Where traffic lanes have been marked, it shall be unlawful for the driver of any vehicle to fail or refuse to keep such vehicle within the boundaries of any such lane, except when lawfully passing another vehicle or preparatory to making a lawful turning movement, or as otherwise authorized by ordinance.
(B) Whenever any roadway has been divided into two 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 is 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 lanes, a vehicle shall not be driven in the center lane except when overtaking and passing another vehicle where the roadway 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.
(3) Official signs may be erected directing slow-moving traffic to use a designated lane or designating lanes to be used by traffic moving in a particular direction regardless of the center of the roadway, and drivers of vehicles shall obey the directions of every such sign.
(Prior Code, § 7-4-8) Penalty, see § 10.99