Speed

No, not the drug. 

As in "speed, a need for."

Velocity, movement, that kind of speed. 

The kind of speed where 40km an hour can be relatively fast speeding up a dirt road but 40km through a school zone is unbelievably slow and has your speedometer creeping towards 50. 

100km on the freeway, no sweat, don't even feel it, 100km along a foreign back road in the dark and you're shitting yourself. 

Princess highway at 70km and you wish you could go faster to overtake the wanker in front of you but 70km down and around a sharp corner and you're slamming on the brakes to 40 before you go careening off the edge and into a sheep or something.

10km trawling through a parking lot looking for a parking space and it's fine but 10km almost anywhere else and you're convinced your Gran could walk faster than this with her walking frame. 

The first time you get into a car and it's terrifying, you're going so fast and you have to concentrate on so many things at once and you look down at the speedo and you're barely pushing 30. Now, on your Ps 30km is a waste of time, or only necessary for very sharp corners, in the dark, when it's raining. 

Speed.
It all depends on perspective, context, conditions, experience. 

Wipe off 5 guys, or wipe out lives.