The Boston Central Artery, (shown from the Industrial Building next to North Station,) showing the divided highway as it extends beyond Haymarket square to the Sumner Tunnel area now open for traffic from Mystic River Bridge southbound; and from Leverett circle, near Museum of Science, which is open for both southbound and northbound traffic. Commissioner John A. Volpe announced that it is anticipated that two-way traffic would be opened on the section from the Mystic River Bridge during the middle to latter part of December.