Abstract
Progress Report No. 120 is the report of the May-August 1986 study of free flow automobile and truck speeds on tangent, level and dry sections of rural interstate, rural 4-lane, rural 2-lane and urban interstate highways in Indiana. The results of this report show that all types of vehicles, on all types of Indiana highways, had an average free flow speed of 58.6 mph in 1986. This indicates an increase of 1.4 mph from 1985. If the two urban interstates are excluded, the average speed on all types of rural highways in Indiana becomes 58.4 mph in 1986. This represents an increase of 1.5 mph from 1985. This report includes a chart that graphically summarizes the results of summer free flow speed monitoring on rural highways since 1977. The report summarizes the changes in speed in 1986 from 1985. The report summarizes the changes in percent of vehicles exceeding 55, 60 and 65 mph in 1986 from 1985.
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