More detail has emerged surrounding a proposed medical marijuana dispensary and cultivation center in West Tisbury, but questions remain as the project works its way through the Martha’s Vineyard Commission.

The commission is reviewing the project as development of regional impact (DRI).

A continued public hearing on Thursday shed light on issues related to security and traffic, as well as the site’s proximity to the West Tisbury School, and state regulations that appear to have caused more confusion than clarity.

Geoff Rose, doing business as Patient Centric, has proposed using 6,600 square feet of a still-unbuilt structure that the commission approved in 2010. Jim Eddy, owner of Big Sky Tents, who plans to build the structure, also attended the hearing. To comply with a town zoning regulation, the cultivation area may not exceed 1,000 square feet.

Mr. Rose said state law requires “sufficient” lighting around the perimeter of the building, although it was unclear Thursday what that means. Plans call for downward-facing lights on the building, stand-alone lights near the ground, lights on poles and infrared security cameras. The commission asked for more information.

In public comments, Vineyard schools superintendent Matthew D’Andrea raised the prospect of future changes if the facility is approved, citing sections of the state general laws that say medical marijuana facilities cannot be prevented from also operating as retail businesses.

“As superintendent of schools, I need to speak out against marijuana facilities, especially recreational,” Mr. D’Andrea said. “It goes against what we teach our students about substance abuse. And certainly the proximity to the West Tisbury School is very concerning to me.”

Mr. Rose has said a retail marijuana business in West Tisbury would be impossible, since the state only grants licenses in towns with package stores. He has also said the state requires only 500 feet between marijuana dispensaries and schools. The proposed site is about 2,500 feet from the West Tisbury School.

Recreational marijuana is legal in Massachusetts following a statewide referendum last November, but laws regulating retail sales are still in their infancy.

On Thursday, Mr. Rose noted that the state law is in flux. “It’s very possible that it’s going to change, and change dramatically in a relatively short period of time,” he said.

The commission plans to consult legal counsel as well.

Much of the discussion on Thursday focused on increased traffic on Dr. Fisher Road, a protected special way that runs between Old County and Old Stage Roads. Commission transportation planner Dan Doyle said an estimated increase of 212 trips per day would create some wear and tear on the road, but would not disrupt the flow of traffic.

In a written response to questions raised at the last hearing, Mr. Rose said customers would be instructed to access the dispensary from Old Stage Road (in the light-industrial district) and not from Old County Road to the east.

Several abutters raised concerns about the increased traffic.

David Fielder wondered if the additional trips would effectively prevent public access to the special way. “I don’t have anything against the dispensary,” he said, although he urged the commission to think about the location.

“This is going to be a massive, negative change to the neighborhood,” said Nolan Pavlik, a sophomore at the high school and a resident of Pine Hill Road, which also runs along the project site. He said Dr. Fisher Road is “in a horrendous condition.”

Farley Pedler said the Dr. Fisher Road association has become interested in better road maintenance. But he questioned the ability to prevent vehicle access from the east. Dan Larkosh pointed out that other business owners in the light-industrial zone, including Big Sky Tents, are contributing members of the road association.

To satisfy the commission’s affordable housing requirement, Mr. Rose has offered to have on-site dormitory housing for employees, pending approval from the state Department of Public Health. In his written comments, he said four employees would live there from mid-May to October. A composting toilet would help protect groundwater quality.

But the proposed housing also raised questions.

“I would be somewhat surprised if they would allow dormitory-style housing in a marijuana facility,” commissioner Gail Barmakian said of the DPH.

Commissioner Joan Malkin said cooking facilities could raise new questions about nitrogen and water quality. She and others pressed for clarification from Mr. Rose about whether the project would in fact include housing.

After about an hour of discussion, commissioner Linda Sibley continued the hearing to June 1. She said continued oral testimony would depend on how much the proposal changes before then. She encouraged people to submit their comments in writing.