5       I-40

            (near Ash Fork, AZ)

            About 10 miles east of Ash Fork there is a brake check area for westbound traffic (near milepost 155½ and some warning signs—"Trucks—vehicles pulling trailers check brakes and equipment—use lower gear" and "6% grade next 6 miles."  The first two miles are 6% followed by about 1½ miles of 4-5%, then 1½  miles of 6% grade.