After an hour at freeway speed you take an exit ramp posted at 50 km/h, and 50 feels absurdly slow. What is the Handbook's name for what is happening to you?

Correct answer: C. Speed adaptation, or velocitization — check your speedometer rather than trusting how fast it feels

Speed adaptation, also called velocitization. The Handbook describes "losing your ability to judge your speed accurately" this way and flags where it bites: "it is a special danger when leaving a freeway." After a sustained period at high speed your sense of what is fast recalibrates, so 50 km/h feels like walking pace and 80 feels reasonable on a ramp designed for 50. The defence is to stop trusting the feeling and read the instruments: check the speedometer on the ramp rather than judging by eye. The Handbook's exit procedure is built around the same problem — "signal that you want to move into the deceleration lane, but do not slow down. When you are in the lane, reduce your speed gradually to the speed shown for the exit ramp" — so that the slowing happens off the through lanes and against a posted number.

Source: MTO Driver's Handbook: Official MTO Driver's Handbook — Freeway driving, Leaving a freeway