Porter Square Traffic Hazard

A hidden driveway permits dangerous entrances into the traffic patterns of Porter Square. Leaving the driveway when traffic is stopped on Mass Avenue in both directions vehicles exiting the parking lot behind the Passage to India Restaurant can cross Mass Avenue into pedestrian traffic with walk lights lit. The sign which says, "Right Arrow, only" is hidden to cars until they are almost upon the sign as can be seen in this brief video.
Regular users of the parking lot have been seen ignoring that sign creating a hazard for pedestrians.