The National Highway Traffic Safety Administration (NHTSA) and FMCSA have a joint project underway with the Virginia Tech Transportation Institute (VTTI) involving the use of Camera/Video Imaging Systems (C/VISs) in large trucks to improve visibility. Both mirror surrogates and enhancements are being studied and tested. Mirror enhancements provide the driver with images that are presently unavailable from standard mirror configurations (e.g., elimination of blind spots). Mirror surrogates provide the driver with the same or similar images that are available from standard mirror configurations. In the first part of this project, the tests are limited to conventional video systems, with cameras at appropriate locations on the exterior of the vehicle and with video monitors in the cab at locations that have been selected on the basis of human factors considerations and preliminary testing.