It's really about your field of view, which is somewhere near 90 in N4 and
in real life the fov is nearer to 180 degrees.
So if you look outside of the side window of your car when you are doing
60mph, it feels a lot faster than it would seem if you concentrate looking
on a distant point straight ahead.
So the speed is real to life in N4, you just need to add a couple monitors
more to really show the speed. In GPL I feel that the sound of the engine
tells you a lot of your current speed...that's my 2 cents.
M