Over here, you can do an advanced riding course with police motorcyclists. When they teach you to 'make progress' quickly cross country, they teach you to use the whole road. Buzz knows more about it than me, maybe he can chime in.
I suspect there is more to this, as advanced cornering techniques get quite involved. However, let me relate a comment on the mind set of people under pressure.
An accident investigator was asking a fireman why he tried to drive a 40t truck over a 20t bridge and the fireman answered it was an emergency! Apparently it is not uncommon in high stress, time critical, decision making to try and overcome the laws of physics. Police and firemen are faced with this type of decision making all the time and still make mistakes.
When you are riding fast you gauge your corner entry speed by the amount of usable road. If that usable road suddenly changes to the front bumper of a truck you will not likely complete that corner. Riding the twists is fun and but so is living to do it again.