Interestingly enough I had a cop car park in front of and block my driveway yesterday when there was a perfetly good parking spot RIGHT IN FRONT of him.
I live in a suburb of Milwaukee, but I just wanted to share this cops stupidity and arogance.
As for the OP, if you mean youd be parking in your driveway but across the sidewalk, Id be willing to bet LARGE sums of money that it is illegal. I know it is here. Your lot line ends at the sidewalk in most cities/states. That part of your "driveway" and the apron leading to the street itself is city owned.