When any roadway has been divided into lanes, a driver of a vehicle shall drive so as to be entirely within a single lane and shall not move from the lane in which he is driving until he has first ascertained if such movement can be made with safety.
Upon all roadways, the driver of a vehicle shall drive in the lane nearest the right side of the roadway when said lane is available for travel, except when overtaking another vehicle or when preparing for a left turn.
The driver of a vehicle shall not overtake and pass a vehicle proceeding in the same direction unless there is sufficient clear space ahead on the right side of the roadway to permit the overtaking to be completed without impeding the safe operation of any vehicle ahead.
The driver of a vehicle, when about to be overtaken and passed by another vehicle approaching from the rear, shall give way to the right in favor of the overtaking vehicle, on suitable and audible signal being given by the driver of the overtaking vehicle, and shall not increase the speed of his vehicle until completely passed by the overtaking vehicle.
A. 
No person shall drive in such a manner as to obstruct unnecessarily the normal movement of traffic upon any street or highway. Officers are hereby authorized to require any driver who fails to comply with this section to drive to the side of the roadway and wait until such traffic as has been delayed has passed.
B. 
No driver shall enter an intersection or a marked crosswalk unless there is sufficient space on the other side of the intersection or crosswalk and on the right half of the roadway to accommodate the vehicle he is operating without obstructing the passage of other vehicles or pedestrians, notwithstanding any traffic control signal indication to proceed.
The driver of a vehicle shall not follow another vehicle more closely than is reasonable and prudent, having due regard to the speed of such vehicle and the traffic upon and condition of the street or highway.
Upon roadways less than 27 feet wide and upon which vehicular traffic is permitted to operate in both directions, the driver of any slow-moving vehicle when traveling outside of a business or residential district shall not follow another slow-moving vehicle within 200 feet, but this shall not be construed to prevent such slow-moving vehicle from overtaking and passing another slow-moving vehicle. This section shall not apply to funerals or other lawful processions.
The driver of any vehicle, before starting, stopping or turning from a direct line or backing, shall first see that such movement can be made in safety. If the operation of another vehicle should be affected by a stopping or turning movement, the driver of such vehicle shall be given a plainly visible signal, as required by the following section.
Hand and arm signals, as required herein, shall be made in conformity with the requirements of MGL c. 90, § 14B.
The driver of a vehicle shall not drive upon any sidewalk except at a permanent or temporary driveway.
A. 
Every driver of a vehicle, or other conveyance, approaching an intersection of ways where there exists facing him an official sign, bearing the word "stop" and authorized by this section, said sign having, apart from this regulation, the written approval of the Massachusetts Department of Transportation, and such approval being in effect, shall, before proceeding through the intersection, bring such vehicle, railway car or other conveyance to a complete stop at such point as may be clearly marked by a sign or line, or if a point is not so marked, then at a place between the "stop" sign and the nearer line of the street intersection. In the case of a line of two or more vehicles approaching such "stop" sign, the drivers of the second and third vehicles in line in any group shall not be required to stop more than once before proceeding through the intersection. This section shall not apply when the traffic is otherwise directed by an officer or by a lawful traffic-regulating sign, signal or device.
B. 
In accordance with the foregoing, the erection and maintenance of an official "stop" sign or signs are authorized so as to face as follows:
Name of Street
Stop Sign(s) Facing
At Intersection of
Allston Avenue
East and west
Cold Spring Avenue
Allston Avenue
Northwest
River Street
Amostown Road
East
Kings Highway
Amostown Road
North and south
Piper Road
Amostown Road
South
Pease Avenue
Ashley Avenue
North
Ashley Avenue (as relocated)
Ashley Avenue
Northeast
Wayside Avenue
Ashley Street
[Added 2-21-2017; amended 6-20-2023]
Southeast and southwest
Summit Street and First Street
Baldwin Street
North at Sears Way
River Street
Baldwin Street
Southeast
Memorial Avenue
Birnie Avenue
Northeast
Piper Road and Birnie Avenue
Birnie Avenue
South
Morgan Road
Bliss Street
East and west
Union Street
Bliss Street
East and west
Western Avenue
Bradford Drive
West
Craig Drive
Bridge Street
West
Main Street
Brush Hill Avenue
West
Piper Road
Cayenne Street
Southeast
Morgan Road
Churchill Street
East
Harwich Road
Cold Spring Avenue
Northeast
Baldwin Street
Cold Spring Avenue
[Added 12-18-2017]
Northeast and southwest
Norman Street
Cold Spring Avenue
[Amended 3-16-1966]
Southwest
Baldwin Street
Colony Road
South
Memorial Avenue
Cornflower Drive
[Amended 12-19-2011]
East and west
Rogers Avenue
Craig Drive
North and south
Myron Street
Day Street
Northeast and southwest
Union Street
Dewey Street
East
Amostown Road
Edgewood Road
East
Sawmill Road
Fausey Drive
North
Circle Drive
Fausey Drive
South
Amostown Road
First Street
[Added 6-20-2023]
South
Summit Street and Ashley Street
Fox Street
East
Route 5 (Riverdale Street)
Garden Street
East
Route 5 (Riverdale Street)
Hampden Street
[Added 12-18-2017]
East and west
Pleasant Street
Healy Street
South
Ashley Street
Heywood Avenue
Northwest
Cold Spring Avenue
Heywood Avenue
Northwest
River Street
Heywood Avenue
Southeast
Cold Spring Avenue
Homestead Avenue
West
Massachusetts Avenue
Interstate Drive
South
Prospect Avenue
Janet Street
South
Forris Street
Jeffrey Lane
South
Jeffrey Lane at Jeffrey Lane
Johnson Street
East and west
Wilder Terrace
Lathrop Street
South
Southworth Street
Maple Street
East
Boulevard
Maple Street
East and west
Chestnut Street
New Bridge Street
East and west
Main Street
New Bridge Street
East and west
Union Street
Norman Street
[Repealed 12-18-2017]
Norman Street
Northwest and southeast
Cold Spring Avenue
Norman Street
Southeast
Memorial Avenue
Old Barn Road
West
Havenhurst Road
Old Bridge Street
Southwest
Memorial Avenue
Park Drive
East
Harwich Road
Pine Street
South
Westfield Street
Piper Cross Road
Northeast
Morgan Road
Piper Cross Road
Southwest
Piper Road
Piper Road
South
Kings Highway
Pleasant Street
[Added 12-18-2017]
North and south
Hampden Street
Pleasant Street
North and south
High Street
Prospect Avenue
North
Highland Avenue
Roanoke Avenue
Northwest
River Street
Roanoke Avenue
Southeast
Cold Spring Avenue
Rogers Avenue
North
Dewey Street
Sears Way
South
Baldwin Street and River Street
Second Street
North and south
Upper Church Street
Second Street
South
Front Street
Southworth Street
East
Route 5 (Riverdale Street)
Southworth Street
East and west
Lathrop Street
Summit Street
East and west
Second Street
Summit Street
[Added 6-20-2023]
Northwest
First Street and Ashley Street
Sweetfern Drive
North and south
Woodbrook Terrace
Terry Road
North
Harwich Road
Upper Church
East and west
Second Street
Van Deene Avenue
North
Westfield Street
Verdugo Street
East
Morton Street
Verdugo Street
East and west
Lancaster Avenue
Virginia Avenue
[Added 12-18-2017]
East and west
Ely Avenue
Warren Street
East
Route 5 (Riverdale Street)
West School Street
Southwest
Union Street
Wilder Terrace
South
Ashley Street
Woodmont Street
North and south
Verdugo Street
Upon such roadways as are divided by a parkway grass plot, reservation, viaduct, subway or by any structure or area, drivers shall keep to the right of such a division except when otherwise directed by an officer, signs, signals or markings.
A. 
General.
(1) 
Colors and arrow indications in traffic control signals shall have the commands ascribed to them in this section, and no other meanings, and every driver of a vehicle or other conveyance shall comply therewith, except when otherwise directed by an officer or by a lawful traffic regulating sign (other than a "stop" sign"), signal or device.
(2) 
In no case shall a driver enter or proceed through an intersection without due regard to the safety of other persons within the intersection, regardless of what indications may be given by traffic control signals.
B. 
Green. While the green lens is illuminated, drivers facing the signal may proceed through the intersection, but shall yield the right-of-way to pedestrians and vehicles lawfully within a crosswalk or the intersection at the time such signal was exhibited. Drivers of vehicles making a right or left turn shall yield the right-of-way to pedestrians crossing with the flow of traffic.
C. 
Right, left and vertical green arrows. When a right green arrow is illuminated, drivers facing said signal may turn right. When a left green arrow is illuminated, drivers facing said signal may turn left. When a vertical green arrow is illuminated, drivers facing said signal may go straight ahead. When a green arrow is exhibited together with a red or yellow lens, drivers may enter the intersection to make the movement permitted by the arrow, but shall yield the right-of-way to vehicles and pedestrians proceeding from another direction on a green indication.
D. 
Yellow. While the yellow lens is illuminated, waiting drivers shall not proceed and any driver approaching the intersection, or a marked stop line, shall stop at such point unless so close to the intersection that a stop cannot be made in safety; provided, however, that if a green arrow is illuminated at the same time, drivers may enter the intersection to make the movement permitted by such arrow.
E. 
Red.
(1) 
Traffic facing a steady circular red signal alone shall stop at a clearly marked stop line or, if none, before entering the crosswalk on the near side before entering the intersection and shall remain standing until an indication to proceed is shown except as allowed by MGL c. 89, § 8.
(2) 
No driver of the vehicle facing a circular red signal indication shall make a right turn where official traffic signs are installed and maintained prohibiting such turn at the following intersections.
(3) 
The direction of travel and names of the streets from which right turn on red will be prohibited are listed below:
Name of Street
Direction of Travel
At Intersection of
Baldwin Street
Southbound
Memorial Avenue
Bresnahan Street
Southbound
Memorial Avenue
Chestnut Street
Southbound
Westfield Street
Elm Street
[Added 10-2-2023]
Southbound
Kings Highway
Kings Highway
Eastbound
Elm Street
Memorial Avenue
Eastbound
Entrance of Century Shopping Center
Memorial Avenue
Westbound
Baldwin Street
North Boulevard Street
Southbound
Westfield Street
Park Street
Westbound
Elm Street
Second Street
Northbound
Westfield Street
Westfield Street
Eastbound
Second Street
Witch Path
Westbound
Elm Street
F. 
Red and yellow. While the red and yellow lenses are illuminated together, drivers shall not enter the intersection; and during such time the intersection shall be reserved for the exclusive use of pedestrians.
G. 
Flashing red. A flashing red lens shall indicate those intersections at which a driver is required by law to stop before entering.
H. 
Flashing yellow. A flashing yellow lens shall indicate the presence of a hazard and drivers may proceed only with caution.
I. 
Flashing green. A flashing green lens shall indicate an intersection or pedestrian crosswalk in use and subject to use by entering or crossing traffic. Drivers may proceed only with caution and shall be prepared to comply with a change in the signal to a red and/or yellow indication.
No vehicle shall be driven or moved on any street or highway nor shall any owner of any vehicle knowingly permit such vehicle to be driven or moved on any street or highway unless such vehicle is so constructed or so loaded as to prevent its contents from spilling, dropping, sifting, leaking or otherwise escaping therefrom. Vehicles loaded with any material which may be blown by the wind shall be suitably covered to prevent the contents from being blown upon the streets or highways.
Where official traffic control devices are erected directing specific traffic to use a designated lane or designated lanes to be used by traffic moving in a particular direction regardless of the center of the roadway, or to prohibit a turn or to make a required turn at an intersection of roadways, drivers of vehicles shall obey the direction of every such device. In accordance with the foregoing, the streets listed are incorporated in this section.
A. 
Left lane must turn left.
Name of Street
Turn Restriction
East Elm Street
Westbound traffic onto southbound Elm Street
Elm Street
Eastbound traffic onto East Elm Street
Elm Street
Northbound to Kings Highway westbound
Kings Highway
Eastbound to Elm Street northbound
Kings Highway
Westbound traffic into commercial driveway at Westfield Street and onto eastbound Westfield Street
Memorial Avenue
Northbound traffic onto River Street
Park Avenue
Eastbound traffic at Van Deene Avenue
Park Street
Westbound traffic at Western Avenue
River Street
Eastbound traffic onto northbound Memorial Avenue
South Boulevard
Northbound traffic onto Westfield Street
Westfield Street
Eastbound traffic onto Janet Street and Kings Highway
B. 
Right lane must turn right.
Name of Street
Turn Restriction
Elm Street
Northbound traffic onto East Elm Street
Elm Street
Southbound to Kings Highway westbound
River Street
Eastbound traffic onto southbound Memorial Avenue
Westfield Street
Eastbound traffic onto South Boulevard
C. 
Left turn yield on green.
Name of Street
Turn Restriction
Elm Street
Northbound to Kings Highway westbound
Park Avenue
Eastbound traffic at Van Deene Avenue
Park Street
Westbound traffic at Western Avenue