Whether you witness something or not is a function of a ton of other things too, so much that it makes your anecdotes useless if not actively harmful.

For example, if you live somewhere where you use the highway more often, that sure as heck can skew the result.

Or if you live(d) somewhere where people tend to hit and run instead of waiting... you're obviously not going to witness them as often.

Also, note that accidents and injuries are not the same thing. You can totally have fewer accidents but more injuries or fatalities.

Without knowing the neighborhoods you've lived in (so people can compare the data for themselves) you're really not going to make a compelling case.