Montana Title 61. Motor Vehicles § 61-8-339. Vehicle approaching or entering intersection

(1)(a) Except as provided in subsection (1)(b), when two or more vehicles enter or approach an intersection from different highways, the driver of the vehicle on the left shall yield the right-of-way to all vehicles approaching from the right that are close enough to constitute an immediate hazard.

(b) The driver of a vehicle on a highway that intersects another highway without crossing it shall yield the right-of-way to all vehicles approaching from the other highway that are close enough to constitute an immediate hazard.