http://www.msnbc.msn.com/id/23710970/?GT1=43001 The executive summary: Regarding safety, redlight cameras are about neutral as they increase rearend collisions but may reduce T-bone crashes in intersections. Regarding their reason for existing: It's the money and only the money.

http://www.sciam.com/podcast/episode.cfm?id=A3509A37-CE58-9DCD-DA102EB07CF47DD0 Maybe its because the drivers are slamming on their "breaks". That'll do it every time.