Cops sit in the parking lot of Joslin Sign Company, which is adjacent to Carl Black Chevrolet, and between Arlington Ave and Foster Ave. They usually run laser and aim toward Arlington Ave at northbound traffic (at traffic moving toward the city). Beware – approaching this trap your line of sight to the cops is completely obstructed by the railroad overpass. You’ll get little to no warning on a laser detector. Do not speed between Arlington and Foster Ave.! This is worked almost daily.