BOSTON -- As the Fourth of July holiday approaches, Massachusetts state police urged motorists to stay safe Friday.

NewsCenter 5's Steve Lacy reported that state police joined with their counterparts in New England and New York to kickoff Operation Care.

"Operation Care was formed to deter the three key causes of highway fatalities -- speeding, impaired operation and the failure to use occupant restraints," Massachusetts State Police Col. Mark Delaney said.

A key component of the effort to keep impaired drivers off the road is the state police breath alcohol testing mobile. It's essentially a traveling police station, where a person can be booked and held for transport.

"We've been averaging between 12 and 15 arrests per sobriety checkpoint," State Police Lt. Dana Pagley said. "It's not only for the enforcement end, but also for an educational tool."