Phoenix Raceway

PIR has a unique tri-oval shape, with a curve in middle of its backstretch between turns two and three, commonly referred to as "the dogleg". This exists because the original builders were constrained by both the rocky hills located on the property and their incorporation of an external road course and dragstrip into PIR's design. Once nearby Firebird International Raceway became a regular stop on drag racing tours, PIR's dragstrip was rarely used. The external road course, which was used mainly for private testing and as parking lot access roads during oval events, was later replaced by the current infield road circuit.