My TomTom kinda does that already.
On certain motorway junctions (the tricky ones I guess) it displays an image of the junction with guidance arrows showing which lane to be in. Works well and is very handy when you hear 'at the next junction keep in the middle lane then turn right' !? When it's a four lane multiple junction.

There's also an option to 'show images' which I'm not sure what it does as enabling/disabling doesnt' make any difference, but I guess it will show an image of a landmark or suchlike as you get close to it. Doesn't work round here but maybe in a major city ?

Yeah I've seen pictures of the motorway thing, seems pretty handy especially when like you say there are 4 lanes or whatever.

I was thinking of something more for urban areas though, with traffic lights and that, although as Pete says, a map view might be more helpful there, unless some kind of virtual scene could be constructed akin to the motorway one. (are they generated automatically, or are they pre-rendered?)

I think someone should do a system using augmented reality where it uses a HUD on your windscreen and overlays an arrow on the junction it wants you to turn off on, now that would be cool!

What about it?

What do I enjoy about it?

Yes.

I get enjoyment from the actual driving, the changing gears, acceleration etc. I particularly enjoy challenging roads to drive on. I also like speed.

Sort of like this? Man I can't wait for stuff to become available. It's gonna be like living in a sci-fi film, only without the flying.

Yeah, that's the sort of thing or like this one http://www.crunchgear.com/2011/05/09/pioneer-shows-aumented-reality-powered-car-navigation-system/ although the pioneer one looks more than a little cluttered and a bit Japanese!