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The 189th General Court of the Commonwealth of Massachusetts

Section 4C: Heavy trucks; driving in right-hand lane on multi-lane highways

Section 4C. On any highway with more than one passing lane in the same direction, heavy commercial vehicles, except buses, shall be restricted in ordinary operation to the right-hand travel lane, and in overtaking and passing shall be restricted to the next adjacent passing or travel lane, and shall not use any other lanes except in an emergency. For the purpose of this section, heavy commercial vehicles shall be defined as those in excess of two and one half tons used for transportation of goods, wares, and merchandise.