1987•Unpublished venueRequires access
TRAFFIC SPEED REPORT NO. 121. JOINT HIGHWAY RESEARCH PROJECT
David L. Cochran, Leroy Gray
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Abstract
The results are reported of a 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 study shows that all types of vehicles, on all types of Indiana highways, had an average free flow speed of 59.3 mph in 1987. This indicates an increase of 0.7 mph from 1986. The average speed on all types of rural highways, excluding the 2 urban interstates, becomes 59.1 mph in 1987. This represents an increase of 0.7 mph from 1986. All types of vehicles on rural interstate highways had an average speed of 62.3 mph, which is up by 2.2 mph from 1986. This is not unexpected since the implementation of the 65 mph speed limit on Indiana rural interstate highways effective June 1 1987. Charts and figures are presented which summarize the speed monitoring in 1978, and the changes in speed in 1987 from 1986.