I'm with Glenn on the fume deal. I live on a cul-d-sac one house from the end have a three-car garage and a 40 foot driveway so backing out is very easy and essentially pretty darn safe.
With all that going on, I can park 9 cars off the street and 2 more on the sides behind the respective gates. I am quite fortunate of course and wish it was that easy for all of you.