The Danbury Planning Commission is holding another hearing tonight into an application for a car dealership near the airport.  The Commission has received a 200-page traffic study of 6 intersections near the proposed Mercedes-Benz dealership.  The report found that there would be little change in traffic volume if the application is approved.  Curry Automotive is looking move its Mercedes-Benz dealership from Federal Road to a 2-and-a-half acre property at the corner of Miry Brook and Sugar Hollow roads.  The intersections are currently rated by the state Department of Transportation as As and Bs for congestion, but could drop to C or D during certain days and times.