Interstate 17 runs from Phoenix north to Flagstaff, completely within the state of Arizona.  The northern end in Flagstaff is at Interstate 40.  From there, Interstate 17 heads south past Sedona and through mountainous terrain.  When Interstate 17 reaches downtown Phoenix, it passes south of Interstate 10, before turning easterly to its final endpoint.  Interstate 17 thus forms the western and southern parts of an inner loop around downtown Phoenix, while Interstate 10 forms the northern and eastern parts.  Interstate 17 ends by merging with the eastern leg of the loop carrying Interstate 10, which turns back easterly.

My photo for Interstate 17 comes from its interchange with Arizona State Route 74, near the Anthem area of far northern Phoenix.  The guide marker shown in the photo faces east, marking the start of a cloverleaf ramp from the surface road onto Interstate 17 southbound.  This picture was taken during a trip to the Phoenix area in November 2017.
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