Hmmm...
If you know your local councillor you can write to or go and see him/her, if your English isn't so good. (Not being rude, just it may be easier).
Many, many, years ago I wrote to mine, Richard Burden M.P, and although I never went to see him I think they usually have a 'drop in' session every week at the local community centre. You should get good advice and be pointed in the right direction
If you feel there are other like-minded neighbours it may be worth talking with them to see if It's a matter of concern for others too, although that may not make sense given the area you describe.
The speed limit is something else, so here I go...

If It's anything like a place I know of, how you describe, then it sounds like it doesn't merit a 'one size fits all'. A

may be best, or too fast, during peak times whereas a

may be quite appropriate out of hours.
That concept, in a nutshell, is why I talk common sense, (have an accident-free record), and someone like greenshed posts like a retard...