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Definition
Definition
Cardinality refers to the direction that milepost numbers increase along the road. With some exceptions (see below), mileposts in Arizona start in the south or west and increase in one-mile increments toward the north or east.
Interstate 10 at Benson. The cardinal direction is west to east.
Interstate 17 south of Flagstaff. The cardinal direction is south to north.
The opposite direction is referred to as the non-cardinal direction.
Exceptions to Cardinality
Exceptions to Cardinality
When determining the cardinal direction of the road, it is important to pay attention to the milepost numbers. Cardinality refers to the direction the milepost numbers increase, not to the direction of the road. This is because there are several cases in Arizona where cardinality is reversed and mileposts increase from the north or east toward the south or west. Two examples are US 93 and SR 85.
Example 1: US Route 93
Example 1: US Route 93
The cardinal direction on US 93 between I-40 and Wickenburg starts in the north and ends in the south.
US Route 93 northwest of Wickenburg. The cardinal direction is northwest to southeast.
SR 85 south of Gila Bend. The cardinal direction is north to south.
Example 2: State Route 85
Example 2: State Route 85
The cardinal direction on SR 85 between Gila Bend and Lukeville starts in the north and ends in the south.
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