Taking note of how you perceived the driving conditions to be, unaware that you are incapable of accurately assessing them, at the expense of the safety of others. There is no excuse for being a twat.
Lets see...roads clear...check.
Weather conditions good...check
Car has ability to travel at high speeds, brake better than normal cars, handle better than other cars....and I know how to drive it....check.
What's your problem with this?
The posted speed is often arbitrary....
Or, are you just afraid of speed period?