Next time you’re cruising on the interstate, take some time to spot all the different highway shields. Are there single digits? Double? Triple, even? What do the odd and even numbers actually mean?
HAVERHILL — If you've traveled Interstates 93 or 495 in the Merrimack Valley recently, you may have noticed that exit numbers are not what they used to be. The state is engaged in making a change from ...
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