BOSTON (AP) – A Big Dig ramp connecting the Ted Williams Tunnel westbound to Interstate 93 reopened to traffic Wednesday, one of the busiest travel days of the year.

The so-called “Ramp D” was closed following a July 10 accident in which a motorist was killed by falling ceiling panels in a Big Dig connector tunnel. When it reopens, westbound drivers from Logan International Airport can access north-south I-93.

Ramp D repairs, including replacing epoxy anchor bolts and installing ceiling brackets, were completed earlier this month, according to Executive Office of Transportation spokesman Jon Carlisle. Federal officials gave approval to the opening, he said.

A ramp allowing drivers to reach the Williams Tunnel eastbound lanes already has reopened. The westbound I-90 connector tunnel, where the fatal ceiling collapse occurred, remains closed.

Gov. Mitt Romney said the ramp would eliminate a detour route that caused traffic backups by providing a direct connection between two major highways. “This is a major milestone in the effort to repair the I-90 Connector system,” Romney said.

The ramp had been closed since the July 10 accident that killed 39-year-old Milena Del Valle of Boston, when several ceiling panels came loose and crushed the car she was riding in.

State Transportation Secretary John Cogliano said the ramp was reopened after a repair and inspection process the state completed in conjunction with the Federal Highway Administration.

As part of the repair process, over 1,600 support brackets were either replaced or installed in Ramp D, according to Cogliano. The brackets provide vertical ceiling panel support, as well as lateral reinforcement to the ceiling system in the event of any seismic activity.