The Planning Board approved plans for an access road at the Rochester Crossing property on Tuesday.

The Wareham-based company Rochester Crossing LLC owns the 30-acre site located between Cranberry Highway and Route 58. Developers plan to attract big-box commercial retailers in the future.

Currently, the group Colbea Enterprises has proposed a convenience store, drive-thru coffee shop and gas station on the site. Over the past few months, board members have reviewed plans for the road and the store.

Residents and board members have expressed concerns related to traffic, drainage and access in that time. To address those issues, Rochester Crossing LLC officials agreed to a few terms set by the board, including having a traffic study done.

“Both projects are moving parallel with one another,” said Rochester Crossing LLC Attorney Richard Serkey. “The access road will serve the convenience store should that receive approval next month.”

A public hearing for the convenience store and gas station plans resumes in early September. Johnson said it’s expected the board will close the hearing at that meeting and then vote on the site plan review in late September.

“I think we have a timeline that everybody seems to be on board with, barring some catastrophic revelation that I don’t see happening,” said Johnson.

Tuesday’s vote moved the process forward, but not before several phone calls were needed to determine if the vote would have been allowed under state law.

It was unclear if the four members present were enough to approve the plans.

“We have a little bit of a quorum problem for the Rochester Crossroads project,” Chair Arnie Johnson said.

The board thought that at least five members were needed for the vote until a call to Town Counsel Blair Bailey cleared the matter. Before reaching Bailey, calls were placed to two absent members to see if they would be able to attend.

One member couldn't be reached and the second was unexpectedly delayed in Boston.