My regular commute is 16km. I generally travel at about 23-24km/h but I have a record of 26.5km/h. I chose the route because it has more hills, therefore greater fitness effort so I won't compete with others in this forum. However, one morning, when I had a very strong tailwind (40km/h or so), I chased a car down a hill and reached nearly 55km/h - it was fun.

My route had 4 traffic lights but 2 more have been added. It also had 13 stop signs but now 1 has been replaced with a stop light. I my morning ride starts at about 6:00-6:10 and is done before 7 so there is very little traffic: most stop signs are just decoration and red lights only suggest slowing down.