San Diego County voters narrowly favor paying more to generate fresh money to build more carpool lanes, expand bus and rail services and repair existing roads, according to a new SurveyUSA poll commissioned by The San Diego Union-Tribune and 10 News. But a huge swath of voters remain undecided on Measure G, which would raise the countywide sales tax by half a cent. The survey found 38 percent of respondents said they are certain they will vote yes on the measure. That’s 4 percentage points higher than the 34 percent of respondents who said they are certain to oppose the new tax proposal. However, a full 27 percent of people surveyed said they are not yet sure how they will vote on the measure. The credibility interval was 4.7 percent. SurveyUSA interviewed 700 adults across San Diego County between Tuesday, Oct. 8, and Friday, Oct. 11. Of those, 626 respondents were found to be validly registered to vote, and 582 people had already voted or were considered likely to vote. The pool of people surveyed in the poll was weighted to U.S. Census targets for age, gender, race and homeownership, according to standard polling practices. The outreach coincided with several headlines related to the organization that would be charged with properly spending the added tax revenue. Early last week, the San Diego Association of Governments, or SANDAG, released a pair of audits raising questions about how it has handled toll revenue from the 10-mile stretch of state Route 125 that crosses through portions of South County. Then on Friday, the agency’s board of directors voted to write-off $67 million in toll-road fees and penalties in the wake of a flawed toll-collection system that continues to vex local officials. The former pay-toll system run by ETAN Tolling Solutions was problematic for years and failed to generate the proper financial data, leading to drivers being wrongly charged. The new system the board hired earlier this year was found to be similarly flawed and is not expected to be fixed until July 2025, months longer than board members were told when they approved the no-bid contract, SANDAG officials said. The SurveyUSA poll also asked likely voters who they supported in the upcoming presidential election. Respondents favored Vice President Kamala Harris over former President Donald Trump by 20 percentage points, or 56 percent to 36 percent. The margin of victory was roughly identical to the 21-point lead Harris recorded in July, just after she entered the race. The vice president led by 24 points among women and by 15 points among men. She also led by 31 points among voters over 50, but by just 5 points among voters between 18 and 49. Ballots across San Diego County were mailed out last week, and people can vote through Election Day on Nov. 5.