My son got his license and started driving to school a couple weeks ago. Not so much worried about the parking lot after school as he has to stay every day for track practice (the real rationale for him driving). My concern is the drive to school as I don't want him caught up in the last minute rush of drivers getting to school just before the bell - especially since it's dark when he leaves and rush hour to boot. Our rule is that he has to leave home by a certain time, which puts him well ahead of the rush. And if he start pushing that time and leaving much later,he's back to the bus.
One morning he left just before a major thunderstorm hit. That was exciting

. We saw it coming on radar and he scooted out the door just in time, the downpour started when he hit the parking lot thank goodness.