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TRAFFIC SPEED REPORT NO. 114

R P Guenthner, George Stafford

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Abstract

This report is another in the continuing study of speeds of vehicles on Indiana highways. Observations of spot speeds were taken on interstate, four-lane and two-lane highways throughout the state during the July-September 1980 quarter. This report includes the analysis of the interim speed monitoring procedures which are required as a result of the Surface Transportation Act of 1978. Results of this study indicate a statewide average of 55.8 percent of the vehicles traveling above the 55 mph speed limit. This report also includes analysis of free flow speeds. Results here show that the overall average speeds have changed only slightly from the previous April-June 1980 quarter. Analysis of the free flow speeds recorded during this past year indicate that while the speeds of passenger cars have dropped, the speeds of heavy trucks have increased slightly. (Author)

About this research paper

What this paper is about

This report is another in the continuing study of speeds of vehicles on Indiana highways. Observations of spot speeds were taken on interstate, four-lane and two-lane highways throughout the state during the July-September 1980 quarter. This report includes the analysis of the interim speed monitoring procedures which are required as a result of the Surface Transportation Act of 1978. Results of this study indicate a statewide average of 55.8 percent of the vehicles traveling above the 55 mph speed limit. This report also includes analysis of free flow speeds. Results here show that the overall average speeds have changed only slightly from the previous April-June 1980 quarter. Analysis of the free flow speeds recorded during this past year indicate that while the speeds of passenger cars have dropped, the speeds of heavy trucks have increased slightly. (Author)

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Available abstract

This report is another in the continuing study of speeds of vehicles on Indiana highways. Observations of spot speeds were taken on interstate, four-lane and two-lane highways throughout the state during the July-September 1980 quarter. This report includes the analysis of the interim speed monitoring procedures which are required as a result of the Surface Transportation Act of 1978. Results of this study indicate a statewide average of 55.8 percent of the vehicles traveling above the 55 mph speed limit. This report also includes analysis of free flow speeds. Results here show that the overall average speeds have changed only slightly from the previous April-June 1980 quarter. Analysis of the free flow speeds recorded during this past year indicate that while the speeds of passenger cars have dropped, the speeds of heavy trucks have increased slightly. (Author)

Key concepts: Speed limit, Truck, Environmental science, Quarter (Canadian coin), Traffic speed, Transport engineering, Meteorology, Traffic flow (computer networking)

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