New-vehicle buyers are returning to dealer showrooms in March, lured by incentives, after recall news and bad weather kept them away in February. As a result, March new-vehicle retail sales are projected to increase by 25 percent, compared with the same period one year ago, according to J.D. Power and Associates, which gathers real-time transaction data from more than 8,900 retail franchise points across the United States. Retail transactions are the most accurate measurement of true underlying consumer demand for new vehicles.