The most dangerous intersections to drive in Boston based on state data and honestly my own white knuckle experiences are Massachusetts Avenue and Southampton Street. Absolute chaos with highway access. Morrissey Boulevard and Freeport Street and Dorchester are terrible sight lines and there’s often aggressive drivers.
Andrew Square where it meets 93 is also a mess. Downtown the intersection at Neeland and Atlantic near South Station is a nightmare. I’ve personally seen accidents there. Fresh Pond Parkway and Alewife Brook Parkway in Cambridge is also another disaster zone. Some of the common problems, poor visibility, confusing lane markings, and everyone’s trying to beat the light.