I am a safe driver and I rarely driver more than 100 kmph even in highway. On the road, you will never know what will suddenly happen in front of your running car.
I always drive with speed limit in the road especially in crowded area. It's not also a good idea to drive very fast near the schools. In case of emergency calls, I really drive fast just like the movie Fast and Furious. I'm just kidding.
I always try to drive within the speed limit in order to be safe and avoid those nasty fines. Sometimes I like to go faster but that is usually when I am in Germany since they don't have speed limits on the highway there.