BROOKLYN - New speed cameras will go up in school zones across the borough.

Residents can expect to see 20 school-zone speed cameras in operation when public schools reopen on Sept. 9. The state Legislature agreed in June to let the city set up the cameras to catch and stop speeders.

The cameras record the speed of passing vehicles and tickets are sent automatically.

For the first few weeks, motorists found on camera to be going 10 or more miles above the speed limit will get only warnings. Eventually, drivers will face $50 fines.

The cameras will be set up at unspecified spots within a quarter-mile of some schools.

Mayor Michael Bloomberg unveiled the program Monday and says the ultimate goal is to keep students safe. The program will be monitored by the DOT and there is a possibility for it to expand.