Regardless, as Jan also implies, do it anyway. Find a pattern of the four levels available that looks right and do something with it. Just throwing it up as an imagepan would be proof of concept enough.

I can see that you could find the right ``color scheme'', but the big problem in my mind is that a streetmap isn't very useful without street names, and those are going to be very hard to deal with. The only thing I can think of is some sort of metadata that associates a streetname with positions on the map and dynamically pops them up. Of course, if you're headed for a particular street, then you'd need a way to label that, too.

But all of that comes after someone can show that a map on the empeg display is usable at all.