Can one park right to the edge of a driveway entrance?

I have nightmare neighbors, and have several issues on my street -- some caused by them, some caused by the fact that my street is basically a main road, near some places of worship, and strip malls -- which I keep wrestling with City Hall to get addressed. This is one of the big problems:

My road runs east to west, and I am on the north side. The houses on my side of the street have separate private driveways, with the driveway being on the west side of the property, and the west edge being right on the property line.

The neighbor to the west of me has somehow managed -- despite clear regulations against it -- to widen his driveway so that it is almost triple-wide. My driveway is a very narrow single width (if you have seen residential areas built before the 1950's, you will understand how narrow these can be). Our lots are 40' wide, so the triple-wide entrance of my neighbor means that there is little curb space in front of his house. The largest car that could be parked there, while still parking the car right to the edge of both driveways, is something like a Honda Fit or Nissan Versa. Anything larger is going to park over someone's entrance, and it is always mine that at least gets bumpered.

People who come to park on our side of the street see my neighbor's entrance in front of them, and do not want to block it in any way, pay no attention with what is happening with the rear end of their cars, and so end up partially blocking my drive, or at least parking right to the edge of the west side of my driveway entrance. Also, of note, there is parking permitted on both sides of the street, AND my street is just off what is basically a regional highway, so there is a great deal of traffic, and cars often traveling at high speeds.

As I wrote above, my driveway is still the narrow single width, though I did recently widen the entrance on the east side. So, parking tight to the edge of my entrance can be a problem at the best of times. I do plan to widen my driveway, but restrictions because of a street lamp mean that my new driveway will only be the width of a more modern single-wide.

I have done some initial research, and have yet to see specific details RE clearance of a driveway entrance (typical lack of clarity RE bylaw, building inspection, etc., in my municipality), but I figured that, before I dig deeper, I might as well take a quick survey here. This is my question:

In your municipality, what are the laws/regulations regarding how close you can park to the edge of a driveway entrance? Right to the very edge? If not, how much clearance is required?And, even if the law or bylaw permits this, would it not be basic/common courtesy to not park right to the edge of someone's entrance, especially when that entrance is very narrow?