16 Guam Code Ann. § 3309
(1) When overtaking and passing another vehicle proceeding in the same direction under the rules governing such movement;
(2) When placing a vehicle in a lawful position for and when such vehicle is lawfully making a left turn;
(3) When the right half of a roadway is closed to traffic;
or
(4) Upon a roadway designated and signposted for one-
way traffic.
(b) (1)The Chief of Police shall by regulation establish a distinctive roadway marking which shall indicate no driving over such marking and is authorized either by such marking or by signs and markings to designate any portion of a highway where the volume of traffic or the vertical or other curvature of the roadway renders it hazardous to drive on the left side of such marking or signs and markings.
(2) When such marking or signs and markings are in place, the driver of a motor vehicle shall not drive along the highway to the left thereof, but this shall not prevent turning
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CH. 3 GENERAL PROVISIONS
to the left across any such markings at any intersection or private driveway.
(c) It is unlawful to drive any motor vehicle upon any highway which has been divided into two (2) or more roadways by means of intermittent barriers or by means of a dividing section of not less than two (2) feet in width either unpaved or delineated by curbs, lines or other markings on the roadway except to the right of such barrier or dividing section, or to drive any vehicle over, upon or across any such dividing section, or to make any left turn or semicircular or U-turn on any such divided highway, except through an opening in such barrier designed and intended by proper authorities for the use of vehicles or through a plainly marked opening in such dividing section.
SOURCE: GC § 23117, enacted by P.L. 1-088 (Nov. 29, 1952); repealed and reenacted by P.L. 3-016 (July 14, 1955); as amended by P.L. 14-075:8 (Nov. 9, 1977).