BUFFALO, N.Y. — A prankster’s changes to the message on an electronic roadside sign in Buffalo may be causing motorists to smile, but New York State Police aren’t amused.

WIVB-TV reports someone accessed the keyboard on a sign along Route 198 in Delaware Park on Monday and changed the message to read: “It’s All A Dream.”

The same sign Tuesday flashed “I Love You” before crews shut it down.

The government-agencies coalition responsible for the sign’s traffic messages says it operates them on behalf of a contractor for the state Department of Transportation. The department says it is the contractor’s responsibility to make sure the sign’s keyboard panel is fully locked.

State police say tampering with road signs is illegal and poses a potentially dangerous distraction for drivers.