Cop nearly rear ends someone he is trying to pull over

[Roon]

DENVER -- A five-car pileup involving an unmarked Denver police car sent at least one person in the hospital Wednesday morning.

The police officer in the undercover car was attempting to pull over a vehicle at southbound Interstate 25 and Steele Street when the accident occurred.

The driver panicked after seeing the squad car's lights and slammed on the brakes. The police officer reacted by braking also, and a chain reaction left five cars involved.
http://www.thedenverchannel.com/news/13102950/detail.htm

Anyone that has been pulled over by a cop knows, the cop gets right up on your ass and then flips on his lights/siren. No wonder this happened. I am surprised it doesn't happen more often.