NORTH MERRICK - Drivers traveling through Nassau have been warned: cameras have started snapping photos of school zone speeders.

White vans equipped with photo radar are now operating in front of select schools in Nassau County. Drivers who go more than 10 mph over the posted speed limit will receive tickets in the mail for $80. So far, the cameras are active in Hempstead, North Merrick, Bethpage, Levittown and Elmont.

When the program is fully deployed,  Nassau drivers will see one mobile camera van or one permanent speed camera per school district. The cameras will issue violations during school hours, including summer school. Signs will be posted warning drivers that there may be speed camera enforcement in the area, according to officials.

Officials estimate that Nassau could generate as much as $25 million a year from cameras, but that number is expected to reduce over time as people realize the areas are enforced.

Nassau expects to have all of its cameras up and running by the fall. Suffolk is also planning to set up school zone speed cameras next year.