This report is oriented to: 1. Research and development in highway transportation under sponsorship of the Bureau of Public Roads. 2. Traffic operations and control aspects of highway transportation. 3. Importance of combining vehicle engineering and human engineering along with highway engineering in programs to improve the service, effectiveness, and safety of highway traffic operations.As these new traffic systems, or improvements in the performance of highway transportation emerge, they will require new and far reaching decisions not only for highway users and administrators but for industry as well. Along with decisions there must also be commitments and investments of a scope and magnitude not experienced before.This report describes how new traffic systems are developing, what they consist of, and how they will be of benefit. It treats major features of new traffic systems which very directly involve vehicle and human engineering. It shows that substantial, new, and unusual features in the highway and the vehicle will be called for and suggests the way these might appear.