The overall goals in this project were to perform literature reviews and syntheses, using meta-analytic techniques, where appropriate, for a broad and comprehensive body of research findings on older driver needs and (diminished) capabilities, and a more focused body of work concerning human factors and highway safety, to support the development of specific research products. The research products completed through these activities included: (1) an applications-oriented "Older Driver Highway Design Handbook" intended to supplement standard design manuals for practitioners; (2) an "Older Driver Research Synthesis" oriented toward human factors professionals and researchers; (3) a "Human Factors and Highway Safety Synthesis" capturing major findings and trends in studies of driver use of (and difficulties with) a wide range of highway elements; (4) future research program recommendations that are focused on specified applications and are consistent with the needs identified through other work in this project; and (5) the shell of a relational data base (RIDHER) structured to encompass the information elements in these research syntheses.