(a) The driver of a vehicle approaching an intersection shall yield the right-of-way to a vehicle which has entered the intersection from a different highway.
(b) When two (2) vehicles enter an intersection from different highways at the same time, the driver of the vehicle on the left shall yield the right-of-way to the vehicle on the right.
(c) The foregoing rules are modified at through highways and otherwise as stated in this subchapter.