The Office of Technology Assessment (OTA): an advisory arm of the U.S. Congress whose basic function is to help legislators anticipate and plan for the positive and negative impacts of technological changes, announces two publications in transportation. As usual, the full reports are available from the U.S. Government Printing Office, Washington, DC 20402, U.S.A.,and summary copies are available at no charge from OTA, U.S. Congress, Washington, DC 20510, U.S.A.