Good question. I'm thinking of morning rush hour because that I did a traffic survey then. I noticed a lot of building trades vehicles. All the trades people seem to want to be at their site for the day by 8.30am. I guess that is so they can do a full day's work before it gets dark (which is at 3.30pm in winter). There is also a lot of food suppliers delivering in time for catering teams to make lunch in schools, offices, cafes etc.

I probably shouldn't have called it rush hour. The traffic is busy from 7am until 7pm on weekdays.