§ 1120. Drive on right side of roadway; exceptions. (a) Upon all
roadways of sufficient width a vehicle shall be driven upon the right
half of the roadway, except as follows:

1. When overtaking and passing another vehicle proceeding in the same
direction under the rules governing such movement;

2. When overtaking or passing bicyclists, pedestrians, animals or
obstructions on the right half of the roadway;

3. When an obstruction exists making it necessary to drive to the left
of the center of the highway; provided, any person so doing shall yield
the right of way to all vehicles traveling in the proper direction upon
the unobstructed portion of the highway within such distance as to
constitute an immediate hazard;

4. Where travel on the shoulder or slope is permitted by section
eleven hundred thirty-one of this article;

5. Upon a roadway divided into three marked lanes for traffic under
the rules applicable thereon; or

6. Upon a roadway restricted to one-way traffic.

(b) In addition, upon all roadways, any vehicle proceeding at less
than the normal speed of traffic at the time and place and under the
conditions then existing shall be driven in the right-hand lane then
available for traffic, or as close as practicable to the right-hand curb
or edge of the roadway, except when overtaking and passing another
vehicle proceeding in the same direction or when preparing for a left
turn at an intersection or into a private road or driveway.

(c) Upon any roadway having four or more lanes for moving traffic and
providing for two way movement of traffic, no vehicle shall be driven to
the left of the center line of the roadway, except when authorized by
signs or markings designating certain lanes to the left side of the
center of the roadway for use by traffic not otherwise permitted to use
such lanes, or except as permitted under subsection (a) (2) hereof.