How many major highways in Arizona?

Arizona has three primary numbered U.S. routes and six Interstate Highways through the state.[7] The busiest section of U.S. route or U.S. road is U.S. Route 60 as well as a major section Interstate 10 in Phoenix from downtown heading to Buckeye and entering Pinal County near Casa Grande on the way towards Tucson before exiting Arizona and then crossing over into southern California and New Mexico to the east.