In a more anarchist society this issue would have been resolved within weeks. One possible scenario: Since the parents care passionately about this issue, they all would have chipped in and purchased the street and run it as a cooperative where they can set their own rules.   Ok, there are  now a handful of commuters who can no longer take the  shortest path to their workplace at a high speed, but do they really care enough about losing 10 seconds commute time to purchase back the street (among themselves) at an even higher price than the concerned parents are prepared to pay?