P.R. Laws tit. 9, § 5156
Any vehicle traveling on the public roads whose roadways are duly marked by traffic lanes, shall keep within one of such lanes and shall not cross into another lane without taking the necessary precautions to avoid colliding with another vehicle or causing damages to persons or property. In such cases the following rules shall also be observed:
(a) Whenever any public road whose roadway is divided into two (2) or more lanes through the establishment of a central strip or median for the traffic to flow in opposite directions, every vehicle shall travel only along the lanes to the right of such a strip or median, except as otherwise authorized by markings to that effect, and no vehicle shall be driven through or cross said strip or median, except in those places where there is an opening in the strip or median or at the crossing of an intersection.
(b) On a public road or section thereof whose roadway is divided into three (3) lanes for the traffic to flow in opposite directions, the vehicle shall not travel on the middle lane, except:
(1) To overtake and pass another vehicle when there is reasonable visibility and sufficient space.
(2) To make a left turn.
(3) When authorized by marking to such effect.
Official devices may be installed to regulate traffic, provided the traffic flowing in a particular direction uses a specific lane, or to designate those lanes to be used by vehicles traveling in a specific direction, regardless of the center of the roadway, and every driver of a vehicle shall obey the indications of each of said devices.
Official devices may be installed to regulate traffic, prohibiting the change of lanes in certain stretches of the roadway, and every driver of a vehicle shall obey the indications of each of said devices.
Any person who violates the provisions of this section shall incur an administrative fault and be punished with a fine of twenty-five dollars ($25).
History —Jan. 7, 2000, No. 22, § 6.06, eff. 1 year after Jan. 7, 2000.