Some Billings Drivers Struggling with Back-In Angle Parking Motorists in downtown Billings are adjusting to the change of one-way to two-way streets on N. 29th and N. 30th Street, and while that's been a challenge, the real issue drivers seem to have is the new way to park on these streets. The two-way traffic conversion has been completed as part of the Downtown Traffic Improvement Project, along with the change from head-in to back-in angle parking on these streets, which is a first for Billings. Get our free mobile app According to the Billings Public Works department, there are several advantages to back-in angle parking, which gives drivers a better line of sight to cyclists, pedestrians and other vehicles. Back-in angle parking also provides safer access to unload and load vehicle storage, and allows for the best position to exit the vehicle.