One of the more effective ways to deter ill thought out speed management policy from councils and the like is to ask for proof around their policies.
e.g.
How many people were killed by a speeding motorist who was properly insured, licensed, taxed and motd, not over the limit etc?
Or please provide accident data for road xyz for 3 years before the new lower limit and data since etc..
From the 1st of Jan we will have powers to request any information we like and the authorities are bound to supply within 20 days. Councils up and down the contry are pulling their hair out as they know they will struggle to meet the requirements.
you can find more about your rights here
http://www.foi-uk.org/ But basically if you ask it and the reason is genuine research - they have to provide it as long as it takes them less than (approx 2 days work) and they don't have 100s of people asking for the same thing.
I've already tested my rights by mentioning the act and got an extremely detailed personal response (where previously a standard letter would have been produced).
It's my advice to claim your rights whenever you request information.