TRAFFIC SPEED REPORT NO. 110. INTERIM REPORT, JULY-SEPTEMBER 1979 (INDIANA HIGHWAYS)

In a continuing study of vehicle speeds on Indiana highways, spot-speed observations were made of automobiles and trucks on rural and urban Interstate and rural two- and four-lane highways during July-September 1979. In compliance with the interim speed monitoring procedures required by the Surface Transportation Act of 1978, additional data based on every nth (n=2) vehicle were collected at specified locations to enable computation of required factors. Results indicate a statewide average of 53.5% of the vehicles traveling above the fifty-five mile per hour speed limit, representing a significant drop from 62.3% recorded during the April-June 1979 quarter. Overall free-flow results indicate an average speed of 56.7 mph, representing a 0.5 mph decrease from the previous quarter. Even more significant is the fact that this average speed is the lowest recorded since the implementation of the 55 mph speed limit in 1974.

• Supplemental Notes:
  • See also HS-029 579.
• Corporate Authors:

  Purdue University/Indiana Department of Transportation JHRP

  Purdue University, School of Civil Engineering
  West Lafayette, IN  United States  47907-1284

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Guenthner, R P
  • STAFFORD, G K
• Publication Date: 1979

Media Info

• Pagination: 101 p.

Subject/Index Terms

• TRT Terms: 55 mph speed limit; Average spot speed; Monitoring; Traffic speed
• Subject Areas: Safety and Human Factors;

Filing Info

• Accession Number: 00389094
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: FHWA/IN/JHRP-79/22 Intrm Rpt., HS-029 578
• Contract Numbers: 1 (15)-Pt-1
• Files: HSL, USDOT
• Created Date: Sep 28 1984 12:00AM