+1 Always drive at a speed in which you are able to react/stop to the distance in which you can see. A good friend of mine was killed by some 21year old idiot in a subaru driving like a prick to fast for the distance in which he could see and the road layout. The driver survived and now has to live with killing 2people by driving to fast 4 the conditions etc.
Personally I love speed and im a huge petrol head and have a racing licence. But will only drive at speed when its safe to do so, and public roads are no-way safe for more than 100mph, Most roads considerably less IMO