321.319  Entering intersections from different highways.
  When two vehicles enter an intersection from different highways or public streets at approximately the same time, the driver of the vehicle on the left shall yield the right-of-way to the vehicle on the right.
  The foregoing rule is modified at through highways and otherwise as hereinafter stated in this chapter.
[S13, §1571-m18; C24, 27, 31, 35, §5035; C39, §5026.01; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §321.319]

For applicable scheduled fine, see §805.8A, subsection 7 
Additional penalties for violations causing serious injury or death, see §321.482A