Driving too fast is dangerous, but that’s not the same as exceeding a speed limit.
Speed limit signs are there to tell drivers the maximum permitted speed on that stretch of road, where conditions allow. The national speed limit sign does not mean it is safe to do 60mph if you are driving a car - how many roads can you name with the national speed limit where it would be total folly to drive at 60? So remember, when you leave a 30 limit, and enter the national speed limit, it simply means you are no longer restricted by law to 30mph, it does not mean it is now safe to do 60!
