Chapter 85 of the General Laws is hereby amended by adding the following:
Section XX-
The exit numbers along all interstate highways within Massachusetts shall be converted to a mileage-based system. The plan will include the following provisions:
(a) As closely as practicable, follow the Federal Highway Administration mileage-based exit numbering system
(b) Follow the convention that the numbering shall start at the southernmost or westernmost terminus of the interstate highway
(c) Minimize costs by using existing roadside and overhead signs whenever possible
(d) For a period of two years the exit number of each exit prior to such conversion shall also be displayed at each exit
(e) The mileage-based exit numbering system shall be completed on or before January 1, 2021.
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