BOSTON — The Massachusetts Department of Transportation on Thursday announced the winners of a contest to come up with humorous yet important driver safety messages for electronic highway message boards.

The contest was inspired by a message posted on highways in May that encouraged drivers to “Use Yah Blinkah” — or turn signal — when changing lanes.

The winners were “Make yah Ma proud, wear yah seatbelt,” to encourage belt use, submitted by The Parent’s Supervised Driving Program team of Safe Roads Alliance; “Keep Calm and Drive On,” to prevent road rage, submitted by Patrick Casey of Boston; and “Put down the phone! Your LOLs and OMGs can wait,” to fight distracted driving, submitted by Justin Lovell of Whitman.