Despite confusion and skepticism from local stakeholders, the city will be installing bike and bus infrastructure on some of the Back Bay’s most crowded roads this spring.

The Boston Transportation Department (BTD) confirmed that it will move ahead with alternative transit infrastructure on Boylston and Berkeley Streets as soon as cold weather lets up. The idea prompted furious resistance from locals when first announced given some areas already reach near gridlock and the wider Dartmouth Street is just two blocks over.

“The city plans to move forward with constructing the bike and bus infrastructure on Boylston Street next season. Construction season begins in April though we do not have the exact schedule yet. We will advise the neighborhood when construction is scheduled to begin,” said a BTD spokesperson.

The plans have been adjusted somewhat after a particular outcry around extending the lanes all the way to Berkeley’s intersection with Beacon Street, apparently no longer reaching that far.

“I support a bike lane on Boylston Street and in the Back Bay, but it needs to take into account existing needs, especially pedestrian safety,” State Representative Jay Livingstone said. “Many people have been frustrated by the process that the BTD has run, and I greatly appreciate that when Mayor Wu heard those complaints and stepped in.”

Even with the adjustment, it remains a contentious prospect. The Boylston Street bus lane from Ring Road to Arlington is a particular sticking point since the area is already dense with traffic and plagued with double parking from ridesharing apps and food pickups.

There’s little sign of interest from city officials on the suggestion that a bike lane would be better on Dartmouth Street than Berkeley. Dartmouth Street is less busy and wider, already sporting a bike lane that could be widened and bolstered with some sort of protection.

Dartmouth Street also goes directly to a footbridge leading to the Esplanade, one of the destinations driving the push for bike lanes on Berkeley Street. City planners prefer Berkeley Street because it offers better access to South Boston and the South End.

Martyn Roetter, chair of the Neighborhood Association of the Back Bay (NABB), said his organization still had some ambiguity around the exact form these bike lanes will eventually take.

“NABB is not opposed to bike lanes in principle, but there are some places where it’s inappropriate and in fact very dangerous to put them in. You don’t need to go beyond Commonwealth Avenue to get people from the South End to the Back Bay,” he said.

Exacerbating these grievances is the debate over how exactly the BTD is arriving at its conclusions around bike lanes. BTD assertions that it had conducted studies on the matter were met by demands to publicize them that eventually escalated to a Freedom of Information Act request by Back Bay resident Michael Weingarten.

That request was met by repeated delays prompting an eventual appeal. The city did turn over some documents, but thus far none of them have satisfied demands from opposed residents and local community organizations looking for those analyses the BTD claimed to have.

“We’ve had problems getting information from the BTD,” said Roetter. “They told us that they have all these analyses that justify their choices. We've come to the conclusion that they don’t actually have them and have just been stalling. It’s extremely frustrating. The BTD is not at all receptive to ideas and concerns from people that actually live there.”