Hi insanity and
You can write or email the the LA and ask for information using a freedom of information request (FOI). You can normally find out where to send a FOI from LA wed site. You need to put together a list of information you want from them. Just to start you off I’d ask them for the following:
1. Why are they installing the speed humps.
2. Ask them for accident data for the roads involved.
3. Planning permission.
4. Ask if there have been any complains about car speeding.
I’m not sure what conditions apply to allow the installation of speed humps, I’m sure there will be others who know allot more about this than me so stick around. You should also be able to find out what procedures you need to follow from LA wed site.
You can also find out lots of information from the web just by using Google. I don’t know if this link will give you any help towards putting questions together, might be worth a look.
http://www.abd.org.uk/speed_humps.htm