(south of I-40 in western AZ)
There is a great deal of traffic on
this road—including a lot of truck traffic.
Between I-40 and Wikieup, Arizona there are rolling hills. From Wikieup, about milepost 123, south to
milepost 160 there are many 5-6% grades both uphill and downhill. These grades are not usually steady but
stair step up or down and can add up to a considerable length—as much as 5 or 6
miles. This section is also quite
curvy. The state of Arizona has
marked fatal accident sites with white crosses and there are a number of them
on this road.
From milepost 161 to milepost 172 is
a long straight pull for southbound traffic or a long descent for northbound
traffic. Most of the grade is 3-4%.