A few years ago, Boston added a left turn lane from Mass Ave north to Newbury Street west and the Mass Pike ramp. To line up northbound Mass Ave's two straight-ahead lanes with the lanes on the other side, they added a dashed white line across the intersection to guide traffic to the left.
The line quickly wore away, and now traffic from the left straight-ahead lane goes straight into the right lane on the other side. This is dangerous, and effectively narrows Mass Ave to one lane in one of its most congested spots.
Boston DPW, please repaint the lane dashes across the intersection right away, and continue to do it each spring.