The posts above describe the route fairly accurately except for a couple of points. First, and most important, the route is restricted for
TRUCKS over 50'. I've checked with ADOT and use by RV's, either towed or Class A's or Class C's is not restricted although it is not recommended. Read the signs CLOSELY. This applies to 89A from FLagstaff to Sedona and also from Clarkdale to Prescott. I have run both segments in a large Class A pulling a pickup toad and the route is tight, but doable. On the Flagstaff to Sedona section if you are going south, the route is easier to drive than northbound. The segment along side Oak Creek has a fairly high road crown and if northbound the cliff's on the right are very close to the shoulder. Unless you are careful, it's possible to clear the lower parts of the cliff but hit the upper area or awnings while fully in your lane. Southbound you will see some cliff faces to your right on the hairpin turns, but clearances are not as tight. Overheated brakes and transmissions are possible so if you have a compression brake or Jake brake, use it and control your speed. There are occasional turnouts on both 89A segments, but you'll probably pick up a line of traffic behind you between turnouts. Traffic through Jerome on the southern segment can be tight and busy in tourist season. People don't expect big rigs. There are no runaway ramps on either segment.
Pigman & Piglady
2013 Tiffin Allegro Bus 43' QGP
2011 Chevy Silverado 1500
SMI Air Force One toad brake
Street Atlas USA Plus