ATLANTA — Georgia's top leaders were united on Tuesday: Something must be done this year to pay for the state's transportation needs. But as lawmakers completed their second day at the Capitol, it remained unclear exactly where they will find an estimated $1 billion to $1.5 billion to maintain Georgia's roads, highways and bridges or millions more to expand. A study committee last year gave lawmakers multiple options to support transportation needs, including a 1-cent sales tax, shifting millions of dollars from the general fund to transportation, increasing the state motor fuel tax or charging a "user fee" to get some revenue from electric car owner who don't pay gas taxes.