Sec. 545.051. DRIVING ON RIGHT SIDE OF ROADWAY. (a) An operator on a roadway of sufficient width shall drive on the right half of the roadway, unless:
(1) the operator is passing another vehicle;
(2) an obstruction necessitates moving the vehicle left of the center of the roadway and the operator yields the right-of-way to a vehicle that:
(A) is moving in the proper direction on the unobstructed portion of the roadway; and
(B) is an immediate hazard;
(3) the operator is on a roadway divided into three marked lanes for traffic; or
(4) the operator is on a roadway restricted to one-way traffic.
(b) An operator of a vehicle on a roadway moving more slowly than the normal speed of other vehicles at the time and place under the existing conditions shall drive in the right-hand lane available for vehicles, or as close as practicable to the right-hand curb or edge of the roadway, unless the operator is:
(1) passing another vehicle; or
(2) preparing for a left turn at an intersection or into a private road or driveway.
(c) An operator on a roadway having four or more lanes for moving vehicles and providing for two-way movement of vehicles may not drive left of the center line of the roadway except:
(1) as authorized by an official traffic-control device designating a specified lane to the left side of the center of the roadway for use by a vehicle not otherwise permitted to use the lane;
(2) under the conditions described by Subsection (a)(2); or
(3) in crossing the center line to make a left turn into or out of an alley, private road, or driveway.