http://www.projo.com/news/content/projo_20051104_cr4speed.2c053a5.html
"Cranston became the first municipality in New England to use an automated speed-enforcement system, a laser-and-camera based technology that allows the police to issue speeding tickets without actually chasing down drivers. A police officer will sit in a specialized van alongside a technician from Providence's Nestor Traffic Systems. The officer will observe drivers on a LIDAR system -- essentially, radar using a laser instead of radio waves -- that tracks the car's speed, and cameras photograph the car, driver and license plate. If the vehicle is traveling over the posted limit, the officer can issue a ticket at the click of a mouse, and send the driver a fine in the mail. "
