The answer: the cars have a green light to go straight, but the pedestrians have to wait. This signal is optimized for vehicle movement, at the expense of the safety and convenience of pedestrians. Considering that this is an area with high pedestrian use—at the northern end of the BU Bridge along the Paul Dudley White bike path—it is nonsensical that such priority is given to vehicles rather than pedestrians. The only way to get a "walk" light is to push the "beg button" on either side of the crosswalk—otherwise the light stays at "don't walk" encouraging drivers to make the turn without looking for pedestrians.
But it's worse. Look to the right. There's a second traffic light showing green. Cars driving a downgrade are encouraged to make the turn as fast as possible (the tapered corner doesn't help), at the expense of the pedestrians. Want to cross? Wait until a red light. Although it's not like that will even help that much: cars can still take a right on red (after "stopping").
What could be changed to make this intersection safer?
- The once-you've-turned light should be removed or relocated. Right now it is too far around the curve. By the time a driver sees it in its green phase, they are already crossing the crosswalk. In its red phase, a driver who had missed the main signal would have already crossed the crosswalk. It could be replaced with a "yield to pedestrians in crosswalk" sign.
- The walk signal should be changed to display a "walk" sign with every green phase of the light. This will allow for safer pedestrian movement and will not relegate pedestrians to play second fiddle to automobiles at this intersection. It could be enhanced with conspicuous "yield to pedestrians in crosswalk" signage.
- At slightly more cost (the first two items would simply require reprogramming or removing the lights) the curb should be bumped out to create more of a right turn movement. This will require vehicles to slow down as they make the turn to cross the crosswalk, which will allow them to better look for pedestrians crossing from one side of the roadway to the other.
This is traffic calming at its simplest: traffic throughput will not likely be curtailed (the bottlenecks in this intersection are not due to this light, but are at other locations) and it would significantly enhance conditions for more vulnerable road users.