Wirelessly posted (Opera/9.80 (BREW; Opera Mini/6.0.3/27.2354; U; en) Presto/2.8.119 320X240 LG VN530)
I forgot, the YRCS only covers Yuma, La Paz, Maricopa, Pinal, Pima, (Santa Cruz?) and Cochise counties.
In the rest of the state, try the ADOT/MVD VHF frequencies:
154.905 MVD
156.120 MVD
156.105 ADOT Flagstaff/Tucson
156.135 ADOT Globe/Holbrook/Yuma
156.225 ADOT Kingman/Prescott/Safford
Since I haven't been outside of the Phoenix Metro area to listen, I don't know for sure if ADOT Enforcement uses any of these channels.