Simplify the following text for a Grade 9 native English-speaking person.
Original: U.S. Route 3 is a north -- south United States highway that runs from its southern terminus in Cambridge , Massachusetts through New Hampshire to its terminus near Third Connecticut Lake at the Canadian border , where the road continues north as Quebec Route 257 .
Simplified: U.S. Route 3 is a highway that travels from Cambridge , Massachusetts to the Canadian border .