Domestic mobile septic tank cleaner

The owner of the lane if any can only object, you may seek police protection and get the work done as the service you are availing is in larger public interest and most essential service.  If the Municipality/Corporation is having such service you can utilize their service for cleaning.

You have not posted material facts. Is the path a commonway for you. Is access denied only because cars are parked? Is the parking wilful just to deny access?