Concerned residents want the MBTA to pump the brakes on a plan to eventually use agency bus lanes to move people to White Stadium. According to locals, including the region’s state Sen. Nick Collins, the plan to allow soccer stadium shuttles to use MBTA bus lanes will further clog an already bad traffic situation and potentially violate the state’s environmental review laws. Collins, speaking to the MBTA’s Board of Directors on Thursday, said that he and his constituents were concerned that the agency might by “unintentionally signing off on a proposal that has had no environmental review up to this point, may violate the Taxpayer Protection Act, and would have significant impacts on the environmental justice community.” “I’m here today to request that a public process be commenced by the MBTA to examine the environmental impact, compliance with the Taxpayer Protection Act, and environmental justice laws and regulations, as well as a fair market value assessment approved by the Inspector General, to ensure that the MBTA isn’t signing off on something that would have a negative impact on the MBTA, its employees, and the people they serve,” the Southie lawmaker told the board. The stadium will — eventually — host about 20 professional soccer games annually as well as occasional concerts. The stadium renovation project calls for the use of MBTA bus lanes, bus loading areas, and T stations to move game-goers to their seats. Collins said that some constituents have expressed concerns that adding 11,000 additional people to an already busy set of bus routes and streets wouldn’t help alleviate traffic in Boston, just make it worse. “Close to a 100 private bus trips would be required on game and concert days utilizing MBTA properties,” he said. The state senator did not arrive at the meeting alone. About a dozen residents and a fellow lawmaker — state Rep. Chynah Tyler — spoke up against the MBTA’s involvement. “The volume is of great concern,” Tyler said, noting that she lived in the neighborhood and it already “takes me a long time to get off of my street and get to the main road, or come downtown.” Roxbury resident Pamela Bush told the board that she isn’t surprised that the city and soccer team — the Boston Legacy Football Club — have yet to come up with a viable plan to move thousands of people to a former high school stadium in the middle of Franklin Park. “That’s no surprise to the residents who live here, who understand that a public park with limited parking, nearly a mile-long walk uphill from the nearest train station, is no place for a professional sports complex,” she said. The proposal to use the MBTA’s assets to allow the movement of soccer fans and concertgoers, she said, if allowed, will inevitably end in “traffic gridlock and massive disruption for the people who live around Franklin Park. Residents will be trapped in their communities and unable to move freely.” Bill Lyons, traffic engineer and transportation planner, said that his analysis of the plan finds far too many “flawed assumptions” and a lot of “wishful thinking.” “The result will be transportation gridlock that will create unnecessary safety risks for neighborhood residents. The streets around Franklin Park will turn into a parking lot in the hours before professional soccer games and concerts. MBTA buses will be stuck in this traffic, keeping thousands of riders from getting to their destinations on time,” he said. One potential way to alleviate some concerns, Lyons told the board, would be for the state to conduct the normal Massachusetts Environmental Policy Act review, which would normally occur before such a large project is undertaken, and which has not happened in this instance. The T’s involvement in what would otherwise be a city project, he said, almost certainly demands it. “This state-level environmental review, which every large private development project in Boston normally undergoes, would provide an opportunity for the neutral, fact-based transportation analysis that the public deserves,” he said. Building the new stadium, once projected to cost taxpayers around $10.5 million, has instead ballooned to about $91 million investment. Last month, leaked city documents showed officials are prepared for the taxpayer’s share of the project’s costs to jump toward $172 million as a “worst-case scenario.”