The objective of this project was to develop a guidance report to identify methods that may produce self-enforcing, or self-explaining, roadways during the geometric design process. While safety performance associated with these methods is not well understood yet, an implied outcome of effective speed management is that less severe crashes will result via the application of self-enforcing, or self-explaining, road design principles. Six self-enforcing road concepts and the processes needed to implement the concepts when designing or evaluating existing two-lane rural highways are identified and described in this document. It is anticipated that the concepts may be used to design roadways that produce operating speeds consistent with the desired operating speeds of the roadway. The six methods include: (1) the speed feedback loop process, (2) the inferred design speed approach, (3) design consistency methods, (4) applying geometric design criteria, (5) using a combination of signs and pavement markings, and (6) setting rational speed limits. (Author/publisher)
Abstract