 During World War One, further advances were made in providing care before and during transport – traction splints were introduced during World War I, and were found to have a positive effect on the morbidity and mortality of patients with leg fractures.Two-way radios became available shortly after World War I, enabling for more efficient radio dispatch of ambulances in some areas.Prior to World War II, there were some areas where a modern ambulance carried advanced medical equipment, was staffed by a physician, and was dispatched by radio.