One of the elem and our only middle school has drop off for several reasons,
they have small parking areas that once the staff parks are gone the closest next place is on side streets which are one way and don't have much parking
the school is on a very busy street and there is a very long block you would have to walk down and then cross at the corner (no stop sign or light and it is 4 lanes) and then walk back up to the front of the school to get to the right door (picture a very icy cold snow windy chicago day 8:15am, easily 100 cars lined up on the block with lots of mommas and dads on their way to work in a hurry) 500+ kids go to that school
At the middle school it is so huge, the kids have had two arrival times to stagger out the crowd and rows of buses and cars plus kids walking, I can't imagine a group that large of adults filing in anywhere orderly without someone directing them, they all walk down a little sidewalk on the side of the school and a one way carpool lane is constantly in motion dumping kids out into that group making there way in.
so they have one lane you can drop off and only the passenger side of van/car doors are supposed to open and the kids flow out to the walk. Actually the drop off is easy, it's the pick up that I have trouble with, when I go get my neighbors kids I don't know what color jacket or anything and they finally know how to look for my van cause I tie a scarf on the attenna now. Even if the kids are in your car, you can not pass or pull forward till the cars lined up in front of you have their passengers inside, today was no exception.
Made me really glad we homeschool now so we only do it as a favor for neighbors once in a while. It may sound crazy but the school were prob built way before the road was so busy and they were added onto so the parking lots were not designed for the numbers needed. There was a funny movie I think Mr Mom that had a great pick up drop off scene at a school where the main charactor goes to pick up his kid, all the parents are honking at him cause he doesn't know the routine. Worth seeing it was very real and funny.