Oregon Revised Statutes Oregon Vehicle Code § 801.320

(1) If the roadways have curbs, the intersection is the area embraced within the prolongation or connection of the lateral curb lines.

(2) If the roadways do not have curbs, the intersection is the area embraced within the prolongation or connection of the lateral boundary lines of the roadways.

(3) The junction of an alley with a roadway does not constitute an intersection.

(4) Where a highway includes two roadways 30 feet or more apart, then every crossing of each roadway of the divided highway by an intersection highway is a separate intersection. In the event the intersection highway also includes two roadways 30 feet or more apart, then every crossing of two roadways of such highways is a separate intersection.