Section 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.
Structure Massachusetts General Laws
Part I - Administration of the Government
Title XIV - Public Ways and Works
Section 2 - Passing Vehicle Traveling in Same Direction
Section 3 - Sleigh or Sled; Bells
Section 4 - Keeping to Right While View Obstructed
Section 4a - Driving Vehicles in a Single Lane; Motorcycles, Riding and Passing
Section 4b - Driving in Lane Nearest Right Side of Way
Section 4c - Heavy Trucks; Driving in Right-Hand Lane on Multi-Lane Highways
Section 4d - Standing or Parking of Motor Vehicle in a Designated Bike Lane
Section 5 - Penalty; Exceptions
Section 6 - Applicability of Rules of Road to Street Railway Cars
Section 6a - Stopping of Street Railway Cars for Passage of Fire Apparatus
Section 7 - Right of Way of Fire Engines, Patrol Vehicles and Ambulances; Obstruction; Penalties
Section 7a - Restrictions on Use of Ways Upon Approach of Emergency Vehicles
Section 7b - Operation of Emergency Vehicles
Section 7d - Moving of Vehicle Involved in a Crash From a Travel Lane
Section 8 - Right-of-Way at Intersecting Ways; Turning on Red Signals
Section 9 - Designation of Highways as Through Ways; Traffic Control Signs and Devices
Section 10 - Violation of One-Way Traffic; Civil Liability
Section 11 - Marked Crosswalks; Yielding Right of Way to Pedestrians; Penalty