You can only vote once and in the region where you live.

But no doubt Hall County supporters will be pulling July 31 for the passage of the 1 percent transportation sales tax in the Atlanta and Northeast Georgia regions south of Hall.

Hall, which is in the 13-county Georgia Mountains region, would receive about $300 million for regional projects if the tax passes.

But if the sales tax passes in the Northeast Georgia region, it also would pick up the $15 million widening of Ga. 211/Old Winder Highway from Hall to Interstate 85.

If it passes in the Atlanta region, Hall could see the $28 million widening of Ga. 13/Atlanta Highway from Sawnee Avenue in Buford to Ga. 347/Lanier Islands Parkway in South Hall.

Kit Dunlap, president and CEO of the Greater Hall Chamber of Commerce, said travel between regions is inevitable, so support for the sales tax should cross regional lines.

“We have people going to Gwinnett County to work, and we have people living in Gwinnett coming up here to work,” she said.

The Transportation Investment Act of 2010, which paved the way for the July 31 vote, set up transportation regions according to 12 regional commissions already established in the state. Under the law, each region individually approves or rejects the sales tax.

Perhaps no area project spotlights the interlocking of regions more than Ga. 211 in Braselton.

Hall is proposing to use sales tax money to widen Ga. 211 from Ga. 53/Winder Highway to the new Ga. 347/Friendship Road at Bayberry Drive.

The project, expanding the road to four lanes from two, would cost about $40 million — more when adjusted for inflation — and would be completed by 2022, or at the end of the 10-year tax.

The Northeast Georgia region calls for continuing the widening of the road from two lanes to four lanes between Ga. 347 and I-85.

The project, which would run by Chateau Elan resort, also calls for the construction of roundabouts at the proposed Braselton Parkway Extension near I-85 and at the interstate interchange.

The new road would be completed by 2019.

Scott Snedecor, a Ga. 211 businessman and chairman of the Braselton Community Improvement District’s board of directors, said he believes the area “offers tremendous growth potential.”

“And transportation improvements are important to that growth,” he said.

Hall officials have touted the Ga. 211 improvements as key to a burgeoning road network in the area, particularly with the development of the Northeast Georgia Health System’s River Place campus. River Place will feature a 100-bed hospital and two medical buildings.

River Place is off Ga. 211 and the new Ga. 347. Hospital construction is scheduled to finish in the spring of 2014, and its opening is expected in the spring of 2015, officials have said.

The Ga. 347 project, which is pending approval by the Georgia Environmental Protection Division before a contract is awarded, would run as a four-lane and six-lane road between Ga. 211 and Interstate 985.

The stretch in front of the new hospital will be built first, officials have said.

“It’s exciting to know that we have to tear some things down and remove a few trees to prepare for the road,” said Anthony Williamson, health system vice president, in a May interview. “We’ve been working closely with the DOT throughout the life of this project.”

Chad Bolton, the health system’s director of planning, said that Ga. 211 specifically “will help improve access to hospital emergency services.

“We estimate approximately 10,000 ER visits in the first year after opening, with that number expected to more than double in the first five years,” he said.

The new Ga. 347 also would cross Spout Springs Road, which is planned for a widening to four lanes and is included in Hall’s project list for the sales tax.

The Ga. 211 project almost didn’t make Hall’s list. Officials added it at the last minute, after pulling the widening of Browns Bridge Road from McEver Road to Forsyth County.

“Ga. 211 would connect two new four-lane (roads) and the new hospital, (and) that will be a model for transportation planning,” Tom Oliver, chairman of the Hall County Board of Commissioners, said at the time in justifying the move.

Oliver, along with Ruth Bruner, Gainesville’s mayor at the time, served on the Georgia Mountains Transportation Roundtable, which set the projects list last summer for the July 31 vote.

The sales tax has had plenty of detractors, with many saying it will hurt those with fixed incomes and that the still-feeble economy can’t absorb what is being called the “largest tax increase in Georgia history.”

Bruce Hallowell, a Clarkesville resident who lived in Hall for many years, has said he believes — as many opponents do — that the tax would violate home rule of cities and counties.

“There are several attorneys contending this is unconstitutional and will file suit on this issue,” he said.

If the sales tax doesn’t pass in either the Georgia Mountains or Northeast Georgia regions, “the timeline for widening Ga. 211 ... is 2030 or longer,” said Teri Pope, spokeswoman for the DOT’s District 1, which includes Hall.

She did say that, regardless, Halverson Development, a major land owner off Ga. 211, “wants to widen 211 to the side they own, so they would donate the property and pay construction costs.”

“That section is the only part of the widening of the corridor that could occur if (the sales tax) does not pass,” Pope said.