Arizona State Route 101 (SR 101) or Loop 101 is a semi-beltway looping around the Phoenix Metropolitan Area in central Arizona. It connects several suburbs of Phoenix, including Tolleson, Glendale, Peoria, Scottsdale, Mesa, Tempe, and Chandler. Construction began in the late-1980s and was completed in 2002. Loop 101 has three officially designated sections along its route: Agua Fria Freeway in the west valley from I-10 to I-17 Pima Freeway in the east valley from I-17 to Loop 202 (Red Mountain Freeway) Price Freeway in the east valley from Loop 202 (Red Mountain Freeway) to Loop 202 (Santan Freeway) From Wikipedia
