HARRISBURG. (AP) — As of Monday, drivers in Pennsylvania who are picked up by cameras traveling more than 11 mph over the speed limit in a marked highway work zone will get a written warning for a first offense and fines for subsequent violations.

PennLive reports that the Pennsylvania Department of Transportation and Pennsylvania Turnpike Commission announced last week that the statewide automated work zone camera program authorized by a 2018 state law would begin Monday following a 60-day pre-enforcement period.

Signs posted before the enforcement area will alert drivers about the presence of the vehicle-mounted camera systems. PennDOT and the commission say they are choosing areas where the system will be used based on where data suggests the cameras will be effective in ensuring the safety of highway workers.

Officials say the cameras will only be operational in those areas when highway workers are present.

Critics have called the program a revenue-raising tool, but supporters say it’s about protecting highway and construction workers as well as motorists.