Traffic congestion has become very bad in Sedona. It is particularly bad around holidays and on weekends. I visited on a weekday and didn't experience any congestion, except at the crosswalk to be mentioned below.
There is debate about the causes and solutions. One source of problems is said to be the SR 89A/ Forest Rd signal. A project is underway to add another thru lane that will end past the signal. Another is the crosswalk at Tiaquepaque properties (just west of the Oak Creek crossing) This causes congestion because of the pedestrians having ROW over cars. This could be solved by signalizing the crosswalk to make pedestrians wait and cross in groups. The other big issue looks to be the SR 89A/ SR 179 roundabout. I'm wondering how much improvement could be made by replacing the roundabout with a typical signalized intersection. Another more creative idea would be to add Ranger /Brewer Rd to the state highway system and make it one way south, and the current SR 179 one way north from Ranger Rd to SR 89A, and make SR 89A one way west from SR 179 to Brewer Rd. This would effectively create an oblong roundabout, eliminating the need for a signal.
Now as far as road capacity goes, it looks like SR 179 needs to be 4-laned from SR 89A down to the south end of the Village of Oak Creek