SAMPLING AND EVALUATION OF PEAK HOUR FACTOR CHARACTERISTICS

The Peak Hour Factor (PHF) is a major parameter needed for traffic modeling and evaluation of flow characteristics for many transportation projects. The purpose of this research was to evaluate the PHF characteristics in Delaware and to develop a methodology for PHF estimation that could be adopted for further general studies or specific design projects. Sampling of PHFs were performed on 8 two-lane highways and streets in Delaware. The observed PHF values, for 15 minute time intervals, ranged between 0.765 to 0.941. Linear and non-linear models for PHF estimation were presented and calibrated for two-lane roads with 2-way volume of approximately 800 to 2100 passenger cars per hour. It is recommended that the linear model be used for estimation of PHFs for transportation planning purposes. For specific design conditions, it is suggested that a survey of the relevant conditions be conducted based on the methodology that is presented and discussed in this report. Based on previous research findings, it was felt that a 15 minute period is not the appropriate time interval for analysis of PHF values, particularly on non-urban highways. Although it is not recommended that the HCM procedure be changed at this time, a discussion on the proper time period for analysis of PHF is presented. Further studies of PHF characteristics are recommended for other type facilities in Delaware such as 4-lane arterials, freeways, tollways and signalized and unsignalized intersections.

• Corporate Authors:

  University of Delaware, Newark

  Delaware Transportation Institute
  Newark, DE  United States  19716
• Authors:
  • Polus, A
  • Kikuchi, S
• Publication Date: 1989-3

Media Info

• Features: Figures; References; Tables;
• Pagination: 49 p.

Subject/Index Terms

• TRT Terms: Estimating; Methodology; Two lane highways
• Identifier Terms: Highway Capacity Manual
• Uncontrolled Terms: Peak hour factor
• Subject Areas: Highways; Operations and Traffic Management; Planning and Forecasting; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00601283
• Record Type: Publication
• Report/Paper Numbers: 89-T2-4
• Files: TRIS
• Created Date: Nov 30 1990 12:00AM