Expectancy relates to a driver's readiness to respond to situations, events, and information in predictable and successful ways. This report describes the concept of driver expectancy in the context of the driving task, and provides examples of expectancy and expectancy violations. It includes a procedure for identifying general and specific expectancy violations to enable engineers to develop remedial treatments to deal with expectancy problems.

This report presents the findings and recommendations of a project that had the purpose of addressing the critical safety concern of the relationship between highway design and operational factors and the behavioral response of young and inexperienced drivers. Despite the well-recognized safety concerns for younger drivers and the considerable work done in the areas of education, licensing, and enforcement, there has been little empirical work done that directly relates young driver performance to roadway factors, such as geometry, traffic control devices (TCDs), and traffic operations. This project had the general goals of integrating what is known about younger drivers, extending this through some limited new crash data analyses, and then determining the important remaining safety concerns and knowledge gaps related to roadway factors. The project then derived a set of key research issues and developed detailed project statements for a systematic approach to addressing problems. The ultimate objective of the proposed research program is to identify any improvements to highway design, operations, or countermeasures that will reduce the highway safety consequences of problems related to young and inexperienced drivers and, hopefully, other drivers as well.

TRB's National Cooperative Highway Research Program (NCHRP) Report 672: Roundabouts: An Informational Guide - Second Edition explores the planning, design, construction, maintenance, and operation of roundabouts. The report also addresses issues that may be useful in helping to explain the trade-offs associated with roundabouts. This report updates the U.S. Federal Highway Administration's Roundabouts: An Informational Guide, based on experience gained in the United States since that guide was published in 2000.

After several decades of research, practice, intervention, and instruction, traffic psychology is in need of a summary work outlining the main trends in the discipline. Traffic Psychology Today provides a theoretical basis of the topic, a summary of the acquired research in the field, practical applications for government planners, and a critical discussion of future trends. Through a series of chapters contributed by an international group of researchers under the general editorship of Pierre Barjonet, Traffic Psychology Today comprehensively synthesizes thinking in the psychology of traffic from its inception in the mid 1950s through the present day.