Prompted by an email from a Brookline resident, the Globe comes to this busy Allston intersection and finds "all kinds of driving infractions, from drivers impatient to get moving zipping into the intersection and then stopping, thus blocking oncoming traffic, to others, as Roberts described, using a left turn only lane to cut ahead of cars queued up to go straight on to North Beacon Street."
The Boston Transportation Dept's response is that a "left turn only" sign will be posted 40 yards before the intersection and that a traffic camera may be installed to help adjust the timing of traffic lights.
Missing from the City's response is any suggestion of increased enforcement. Cambridge Police have been in Harvard Square recently giving warnings and/or citations to make Mass Ave safer for pedestrians. And I've seen police in Brookline on Harvard Ave trying to maintain some sense of order in Coolidge Corner. But I can't remember the last time I saw a Boston officer at one of Allston's several crazy intersections.