During the dinner hour while returning from an emergency service call unit from Solomons were alerted to Rt 4 @ Rousby Hall Rd for the auto accident reported serious. Units from 3 responded bringing Amb 39 and Engine 34 to find a single vehicle on it's side in the opposing lane. The 303 Command was established by the Chief and the run was held to Company 3 units only. All occupants had self extricated and refused care. Units remained for about 25 mins for clean up.