Virginia Gov. Robert F. McDonnell unveiled a plan on Tuesday to fund Virginia's transportation infrastructure by replacing the state's gas tax with an increase in the sales tax, adding fees on alternative-fuel vehicles and increasing vehicle-registration fees. The plan would generate an estimated $3.1 billion in funds over five years. "If we stick to the old means of funding transportation, we will find ourselves having the same debates and facing the same revenue shortfalls over and over again," said Gov. Robert McDonnell.