This time of the year is pretty close to the Silly Season. Every night there is a corporate Xmas party and there is a lot more traffic during peak home going hour. The cars tend to get more aggressive and pile onto the intersection and making everyone else more agitated.
Also around this time of the year is the end of high school for many. The USA have their Prom Nights. We have Formals. The lucky ones will have theirs on the Sydney Harbour on a boat or a fancy hotel in town.