The Washington, D.C., region has one of the highest carpooling rates in the country -- 12 percent of regional commuters carpool -- and more say they would do it if they could find others who live and work near them. To get these and die-hard solo drivers carpooling, the Washington region plans to start paying them in cold hard cash. Starting this fall, commuters who use three congested corridors will be eligible to earn $2 a day or $1-each-way for sharing rides to work. The program is modeled after similar efforts in Atlanta, Los Angeles and Redmond, Wash. About 29,000 commuters have participated in Atlanta's Cash for Commuters program since it started in 2002, where drivers can earn up to $100 over three months for carpooling, biking, taking public transit or working from home. Even after the cash stopped flowing, 64 percent of Atlanta participants still used those alternatives at least once a week. If the D.C. pilot is successful in easing congested routes, it could be extended to other parts fo the region. The pilot will run for three months starting in October, and will be adminstered by Commuter Connections, a regional network of transportation organizations coordinated by the Metropolitan Washington Council of Governments.