Two legal cases in Arizona courts are ongoing, one a possible appeal of a November Appeals Court ruling banning the billboards on state highways.
The court ruled the billboards violate a 1970 highway beautification bill. The bill Brewer vetoed would have changed that law and allowed billboards.
The Arizona Republic reports the second case involves whether a group pushing an anti-billboard effort in Phoenix can change city ordinances in that fashion.
Save Phoenix Views is collecting signatures for a referendum banning all new billboards and billboard conversions. It is opposed by advertising company CBS Outdoor, which sued.