The "Speed Kills" slogan has been used in various campaigns from a variety of organisations.
The latest information on the government's anti-speeding campaign is here:
http://www.thinkroadsafety.gov.uk/campaigns/slowdown/slo wdown.htm
There's a summary of the RoSPA campaigns here:
http://www.rospa.com/roadsafety/advice/general/campaigns .htm
Current advice and policy documents from RoSPA, relating to speeding, can be found here:
http://www.rospa.com/roadsafety/advice/driving/index.htm #speed
Information about the dangers of speed can be found on the website of the charity, Brake, here:
http://www.brake.org.uk/index.php?p=10
The Slower Speeds Initiative might also be relevant:
http://www.slower-speeds.org.uk/
If you're looking for contrary views, check the website of the Safe Speed campaign:
http://www.safespeed.org.uk/
Hoping this helps,
Chris