Not in inner city mang. In my HS they had 4 entrances unlocked and the school was huge. You'd never make it going outside if you had to go from end to end.Does your school not have an outside?
I never been to a school without inside and outside access, I would just go outside (when not raining) between classes, or chose alternative ways.
You can line a hallway with concrete blocks head high and there are still 3 ways to get to every classroom...
Although I see it as a nusiance, it is easier for me to just choose another route than argue.
