I once read the following on another forum I frequently visit:
"Two people are driving identical cars on the same road, but one is going 50 mph (call it 70 km/h for you metric users) and 60 mph (call it 90 km/h for you metric users). Anyways, when they are both side by side, two deer appear, directly infront of each car, at the same distance. They both brake at the same time, and they both brake with the same pressure. They guy going 50 manages to stop, just inches (decimeters for you metric users) from the deer. At what speed does the guy that was going 60 mph hit the deer.
Scroll down for the anwser
50 mph. For those of you who said 10 mph you are wrong. cars stop exponentially"
I don't remember the precise reasoning, but I know it was true becuase he had explained it well, he was an engineer, and he had sources.
The point of the matter it: for those of you who think going 10 over the limit isn't bad, remember, you will hit the deer at 50 mph.
I'm not old enough to drive, but after reading this, I'll take my time, and not speed.