No, it just adds a lot of realism. I'm not being snarky, NK roads are mostly devoid of cars most of the time from what I've seen (on the Internet, didn't have the privilegue to visit yet).
I've read on a blog belonging to a Russian foreign exchange student that's currently living in the country, that they're actually having traffic problems in Pyongyang this year.
> Or just watch this video of me playing a little bit of the game (apologies for the hideous “demo mode” watermark; my usual screencapture software is broken but this should do until I can fix it)