PITTSBURGH —A Pennsylvania congressman traveled to Pittsburgh International Airport in a driverless car designed by Carnegie Mellon University. Rep. Bill Shuster, a Republican from Altoona, made the 33-mile trip at about 11 a.m. Wednesday. Shuster is the chairman of the House Transportation and Infrastructure Committee, and he was accompanied by Barry Schoch, secretary of the Pennsylvania Department of Transportation. A Carnegie Mellon engineer was in the driver's seat as a safety precaution, but the Cadillac SXR was driven along local roads and highways by a computer system which uses inputs from radars, lidars and infrared cameras.