OMG... That even puts most Amiga racers to shame... And did you see that Pinball Dreams? We need that on MSX as well! (Or at least: I do!) 
In fact, I'm at a crossroad (pun not intended) ... and I'm kinda stuck.
I strongly feel that the 32 sprites won't be enough to give the feeling of fluidity this game deserves.
With 18 sprites already earmarked for the main car and the incoming vehicles, there's only 14 left for the sideroad decor. As I need at minimum 2 sprites per decor item (for colors and for 32x32 overlapping effect), it means I can only display 7 sideroad decor items per frame. So 3 per side. And I have not even yet started to look on the 8 sprites/line limitation ...
If I want more, I'll have to go the blitter way, and use HMMM for software sprites. But that means a complete rewrite of the part of my code that handles objects, at the cost of a slower frame rate.
I know this is the kind of things that can stop my work. Because I can stay frozen like that, unable to decide on what to do. Either continue and have a result that I know won't be at the level I want, or lose myself in rewriting again and again some parts of my code ...
V 9 9 9 0 ! 
V 9 9 9 0 !
Which would make it MSX + V9990 and not MSX.
V 9 9 9 0 !
Some obstacles :
1. I never ever coded for the V9990
2. My road rendering engine is made for a bitmap mode, and P1/P2 are pattern modes
3. I make extensive use of the debugger in BlueMSX, which does not support V9990. OpenMSX does, but does not have a built-in debugger.
4. Indeed, it would be a little bit outside the MSX standard, and I would feel like cheating
