Paper 1: Social effects on highway users and nonusers are described, and reference is made to such effects as mobile and drive-in services and to the effect highways have on public services, opportunities for employment and nonwork activities, and residential patterns and characteristics. Paper 2: Statistical techniques applied to previous attempts to evaluate the impact of highway improvement on rural land values are discussed. Paper 3: Land-use adjustments at interchange locations and the importance of land-use regulation and control in preserving highway efficiency are discussed. Paper 4: The study method employed in a recent examination of the comparative economic impact of three alternative routes for an interstate highway in the vicinity of Mammoth Cave, KY, appears to have general significance for such planning inquiries. Paper 5: The theory of how combinations of factors, including highways, affect the level of economic development is explained.