Cutting into a road surface creates maintenance problems. Since the city is ultimately responsible for it, there are a set of rules, permits, and fees imposed on whomever might be doing the digging, typically an adjoining property owner (for, for example a new driveway) or utility companies, or the city itself (see example photo at right).
The aftermath of any cutting or digging in a road is particularly problematical for bicyclists when it results in longitudinal gashes/gaps/cracks… and is particularly problematical when the crack is within a Bike Lane because it can reduce the usable width to the point where traveling within the BL becomes impossible to do safely; and furthermore these dangerous conditions are unlikely to be appreciated or even noticed by motorists.
The rules set forth don’t seem to be helpful to bicyclists, e.g. there’s not prohibition on cutting along a BL.
Other Phoenix Streets Minutia
There is a very fancy arcgis interactive mapping thing that lays out the entire City of Phoenix pavement management plan; it may have had something to do with T2050 (transportation plan).
I am looking for a similar thing that would map out traffic counts / traffic volume data, similar to what City of Tempe has (scroll down to References)