Nashua has them at various locations. Some are at exit 7 east. When heading east on AMHERST st as you come over the highway overpass BINGO they are there. They are also on the street that leaves the Nashua High school RIVERSIDE ST. Everyday when the High school lets out they are there with radar gun Ready to ticket.. Other locations are exit 8 Northwest BLVD., they hide along rte 101 at various locations. Use caution.. They mix it up a lot.. Everett turnpike Highway has lots of Unmarked cars.