(1) operates a vehicle on any 2-way roadway where traffic moves in both directions simultaneously & drives on to the left of the center of the roadway:

(a) on any part of a grade or on a curve where the driver's view is obstructed for a distance creating a hazard if another vehicle approaches from the opposite direction

(b) when approaching an intersection or railroad crossing where the driver's view is obstructed for a distance creating a hazard if another vehicle approaches from the opposite direction

(c) at any intersection or railroad grade crossing

(2) may drive on the left side of the center of a roadway when:

(a) the right half of the roadway is obstructed or closed to traffic while under construction or repair OR

(b) making a lawful left turn