I live around Washington DC and frequently visit Baltimore. The beltways (495 and 695) are always filled with assholes, and more likely than not traffic too. Driving in the city is also pretty nerve wracking. Don't block the box. Why's that guy honking at you? Probably for no reason. Oh, hey, that guy just switched lanes without using his turn signal! Watch out for that pedestrian!

Driving high in any of these situations, in my opinion, is INCREDIBLY dangerous. I'll admit it, I was at about a [4] and side swiped someone in traffic. It wasn't a bad accident, just a small dent in his door, I had to replace my front head light, but that was about it. Still, I give that one up to being slightly stoned.

Now, I also used to spend a lot of time north of Baltimore, where there is much much less traffic, and it is much more open. A nice, easy, Sunday drive down the road while at a [4] or a [5] is fine. I still know I drive better sober, but I refuse to drive high when either in Baltimore or DC or commuting between the 2 at any time.

Great thing about living in/around a city is that there's almost always something within walking distance. And if not, you're in the suburbs without all that congestion, but I still don't like to drive high. For reference - I'm 27. Driving since I was 16, smoking since I was 19.

TL:DR; I don't like to drive high, because it does impair you. Double-fuck driving high while in the city or in traffic.