Days before Mayor Megan Barry rolls out her long-awaited mass transit plan, a new Barry internal poll says more than half of Nashville voters support raising a combination of four taxes to pay for a potentially $5 billion undertaking.

A telephone poll financed last week by Barry’s campaign committee, obtained by The Tennessean, found that 57 percent of respondents support a plan for mass transit projects, including light rail, that would be paid for by a combination of higher sales taxes, hotel taxes, car registration fees, and business taxes. The poll found 37 percent in opposition.

The survey — perhaps signaling what the mayor plans to put forward — comes as Barry is embarking on a seven-month transit campaign. She wants voters to approve a referendum on dedicated funding for mass transit, but would first need Metro Council approval to add it to the May 1 local primary election ballot.

More:Mayor Megan Barry poll floats four separate taxes for Nashville mass transit

Barry intends to unveil her transit plan, which will include both design and financing details, on Tuesday.

The Tennessean reported the questions asked in the poll last week. Results were outlined in an internal memo that circulated Wednesday.

In addition to light rail, the 30-year transit plan is described as also consisting of bus service with extended hours, more frequent service, and better access for seniors and the disabled.

Light rail critic: poll doesn't mean much without details from mayor

The survey found much greater support for the transit plan when not bringing up the tax increases that would be required, with 78 percent saying they favor the multi-year plan and 17 percent saying they opposite it.

Ben Cunningham, president of the Nashville Tea Party, who is leading a petition effort to fight the mayor's transit plans, said the poll doesn't mean much without details on the mayor's project.

"At this point, we don't know what she's going to propose, so the results — they might not be meaningless, but they're approaching meaningless.

"I simply don't think people have enough information at this point to make a meaningful decision about tax increases," he said. "Until we have details, nobody really knows what it's going to cost and whether railroads in the middle of streets is going to be part of it."

The poll, taken between Oct 1. To Oct. 4, was conducted by Democratic pollster Anzalone Liszt Grove Research, a firm that Barry used in her 2015 mayoral campaign. The survey went out to 501 registered Davidson County voters via landlines phone and cellphones. It has a margin of error of 4.4 percent.

Ahead of next week’s transit plan release, the Transit for Nashville Coalition — a group aligned with the mayor and a business-led political action committee — on Thursday postmarked 50,000 flyers for Nashville mailboxes to try to rally support for the proposed redefined.

“Sick of traffic?” the ad reads in large letters. “Now you can do something about it.”

Barry poll says a majority of Nashville voters back MLS stadium, Cloud Hill

The poll is a snapshot at Barry’s midterm, which has turned into a make-or-break period for the mayor as she pushes three major projects. In addition to transit, Barry is seeking Metro Council approval to build a $250 million Major League Soccer stadium. She’s also fighting strong resistance for controversial plans to redevelop Greer Stadium at Fort Negley Park into a mixed-use project called Cloud Hill.

The survey found 55 percent of poll respondents support and 39 percent oppose building an MLS stadium at the city’s fairgrounds that would be paid for “using mostly private funds, with roughly 20 percent of the costs paid by Metro Nashville Government.”

Despite how the question was framed, Metro would issue up to $225 million in revenue bonds for the MLS project in addition to two separate $25 million general obligation bond resolutions to pay for fairgrounds upgrades and infrastructure improvements.

More:Nashville Sports Authority approves $225M bond resolution for new MLS stadium

The ownership team, under a 30-year stadium lease agreement, would pay the city $25 million in cash and $9 million a year to pay off Metro’s revenue bond debt. Sales tax revenue and dollars from a ticket tax would make up the additional $4 million in annual $13 million debt payments. Metro would be on the hook to pay the difference if the sales tax and ticket tax revenue fall short.

Barry is seeking approval from the council for the MLS stadium on Nov. 7 to put Nashville in position for one of two expansion franchise the league intends to award in December.

On the issue of Cloud Hill, the poll found 55 percent favor the project at the site of abandoned Greer Stadium and 32 percent oppose it. The question described Cloud Hill as a privately funded project that would create more green space, parks space and affordable housing. It did not mention Cloud Hill's retail component, nor did it note that Greer Stadium sits on public land that is part of the original Fort Negley Park footprint.

More:Fort Negley Park recognized as a threatened cultural landscape by national foundation

The same poll noted how some Nashvillians support a different vision for Greer to be transformed back into exclusively park use “as it was originally intended.” The question said that Greer sits on “historically significant land,” but it did not go into details about the fort’s role in the Civil War or its legacy as a place built by slaves.

The poll found that 73 percent of Nashvillians have a positive view of Barry’s overall job performance compared to 25 percent who gave her a negative rating. The poll found African-American voters have an especially high 82 percent favorable rating for Barry.

A Vanderbilt University poll released in March found 72 percent of respondents said they approve of Barry’s handling of her job and 16 percent disapprove.

Reach Joey Garrison at 615-259-8236, jgarrison@tennessean.com and on Twitter @joeygarrison.