Massachusetts · Massachusetts General Laws — Part I, Title XIV, Motor Vehicles
Mass. Gen. Laws (Motor Vehicles) § 89:4: Keeping to right while view obstructed
What this law says, in plain English
Drivers must stay to the right of center when visibility ahead is less than 400 feet, unless pavement markings indicate otherwise. Slow-moving vehicles ascending grades must use the extreme right lane until cresting the hill.
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