An early concept drawing of a roundabout at the Five Corners intersection of Routes 7 and 43 in Williamstown.MASS. DEPARTMENT OF TRANSPORTATION WILLIAMSTOWN â Early reviews are mixed on a proposed roundabout at Five Corners in Williamstown. People have until Feb. 3 to comment on a project that is years away, if it happens at all. Using traffic data, designers estimate that the number of crashes at Five Corners is likely to decrease by about 71 percent with a roundabout, while fatal and serious-injury crashes likely would decrease by about 87 percent. Quote âIâm not in favor of it. That intersection is definitely a problem, but I just donât think a roundabout is the right way to go. And that is a beautiful entrance to town. I donât see how a roundabout will make it any better.â