Traffic Speed Report No. 95 : Progress Report

The attached Progress Report No. 95 on Traffic Speeds is the report of the Oct. -Dec.1975 quarterly study of free- flowing automobile and truck speeds on rural, tangent, level sections of Interstate, 4-lane and 2-lane and on urban inter- state highways in Indiana.The report has been prepared by Mr. A. A. Gadallah, a Graduate Instructor in Research on our staff, under the direction of Professor H. L. Michael.The data were collected by Mr. G. K. Stafford and a number of graduate assistants on our staff.The results indicate a decrease of about 1.0 mph in the average speed of all passenger cars and heavy trucks to that of the 1975 Annual Study.This decrease occurred totally on the rural Interstate system where an expanded enforcement campaign occurred during the period.