There have been numerous thread about the issues of school zones, congestions, unpredictable driver behavior, 'me&mykid&me&mykid&me' attitude, kids everywhere and every which way on foot and bike.
I generally avoid active school zones for these reasons.
Anyway, here are two local news articles about school zone issues:
http://www.eastvalleytribune.com/story/122408 - about the chaos at drop off zones.
http://www.eastvalleytribune.com/story/122393 - about a school bus sideswiping a parent drop off car when trying to pass using grassy area.
Too bad kids don't use the bus anymore.