This study reviews existing reported research and experience regarding use of commercial electronic variable message signs (CEVMS), and evaluates research findings and methods in terms of implications for highway safety and environmental design. Aspects of CEVMS design and use that are capable of adversely affecting highway safety and/or environmental quality are identified and discussed in terms of the adequacy of existing research and experience to permit formulation of quantified standards for safe and environmentally compatible use. This report notes, with illustrations, the principal forms of variable message signage developed for official traffic control and informational use, and the major forms of variable message signage utilizing electronic processes or remote control for display of commercial advertising and public service information in roadside sites. Studies of highway safety aspects of outdoor advertising which are based on analysis of accident data are evaluated and reasons for apparent conflicts of their findings are discussed.

Reports for 1975- include activities under the National traffic and motor vehicle safety act of 1966 and the Motor vehicle information and cost savings act of 1972.