Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 89, § 4B

Upon all ways the driver of a vehicle shall drive in the lane nearest the right side of the way when such lane is available for travel, except when overtaking another vehicle or when preparing for a left turn.  When the right lane has been constructed or designated for purposes other than ordinary travel, a driver shall drive his vehicle in the lane adjacent to the right lane except when overtaking another vehicle or when preparing for a left or right turn;  provided, however, that a driver may drive his vehicle in such right lane if signs have been erected by the department of highways permitting the use of such lane.


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