The majority of road accidents occur between 8-9am and 4-6pm. I recall a statistic indicating most accideents caused by aggressive driving occur post work between 4pm and 6pm. Makes sense, work sometimes pushes us to cracking point, perhaps a bullying manager, and voila! That angry man who's had a bad day is now behind you!
Which leads me on to the flow of negative energy that results.. if like me you hold on to it you can find yourself barking at the moon, well other cars, and so what started as 2 people upsetting one another, ends with a whole school full potentially.. the waves of hostility scattering from one person to the next..