32 CFR 636.25 - Right-of-way.
(a) When two vehicles enter an intersection from different highways at the same time, the driver of the vehicle on the left will yield right-of-way. When entering an intersection without traffic control devices from a highway which terminates at the intersection, that driver will yield right-of-way.
(b) Drivers turning left within an intersection will yield right-of-way to vehicles approaching from the opposite direction.
(c) Drivers approaching a stop sign will stop at the marked stop line, if present, or before entering the crosswalk, if present, or at a point nearest the intersecting roadway where the driver will yield the right-of-way, if required.
(d) Drivers approaching yield signs will slow down to a speed not exceeding 10 miles per hour and yield the right-of-way to any approaching vehicles, coming to a stop if necessary.
(e) Drivers entering or crossing a roadway from any place other than another roadway will yield the right-of-way to vehicles on the roadway.
(f) Upon the immediate approach of an authorized emergency vehicle identified as such, all drivers will yield the right-of-way to the emergency vehicle.