§ 120. Intersection. (a) The area embraced within the prolongation or
connection of the lateral curb lines, or, if none, then the lateral
boundary lines of the roadways of two highways which join one another
at, or approximately at, right angles, or the area within which vehicles
traveling upon different highways joining at any other angle may come in
conflict.

(b) Where a highway includes two roadways thirty feet or more apart,
then every crossing of each roadway of such divided highway by an
intersecting highway shall be regarded as a separate intersection. In
the event such intersecting highway also includes two roadways thirty
feet or more apart, then every crossing of two roadways of such highways
shall be regarded as a separate intersection.

(c) A circular intersection contains an island, generally circular in
design, located in the center of the intersection where traffic passes
to the right of the island.