Whenever any highway has been divided into separate roadways by leaving an intervening space or by a physical barrier or clearly indicated dividing section so constructed as to impede vehicular traffic, every vehicle shall be driven only upon the right-hand roadway, unless directed or permitted to use another roadway by official traffic control devices. No vehicle shall be driven over, across, or within any such dividing space, barrier, or section, except through an opening in such physical barrier or dividing section or space or at a crossover or intersection as established, unless specifically prohibited by official signs and markings or by the provisions of GJMC §
10.04.902. However, this subsection
(1) does not prohibit a left turn across a median island formed by standard pavement markings or other mountable or traversable devices as prescribed in the State traffic control manual when such movement can be made in safety and without interfering with, impeding, or endangering other traffic lawfully using the highway.