[2] The route begins in San Joaquin County at Interstate 580, heading eastward as a freeway.

At the east side of the city, it has a very short concurrency with CR J7 as it exits Modesto and enters Empire.

This was due to the unusual curve that the road takes on near the end of its course in Mariposa County, created in order to support the hills of the Sierra Nevada.

The patrol car was hired for a visit that Queen Elizabeth II was planning to Yosemite National Park in March 1983.

[9] Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage.