A brief comparison of human performance in a man-machine system and in a Vehicular Transport System is carried out. Factors influencing the human performance are cited. Some of the problems connected with research work pertaining to VTS are summarized. Results of an experimental investigation, in which effects of road noise and vehicle speed on human performance were studied, are reported. The findings of the investigation indicate that noise is a significant variable as far as human performance in a VTS is concerned.