The Influence of Grade on the Queue Discharge Rate of Urban Signalized Intersections in Taipei

The grades of upstream sections may affect the discharge rates of queuing vehicles at signalized intersections. In the 2000 U.S. Highway Capacity Manual (HCM 2000) published by the Transportation Research Board, the grade adjustment factor was used to reflect the effect of grade on intersection capacity. In Chapters 13 and 18 of the 2011 Taiwan HCM, the values suggested in HCM 2000 were used to estimate the capacity of automobile and motorcycle lanes at signalized intersections. To understand the characteristics and related adjustment factors, this study collected field data about urban steep road sections in Taipei and established the regression models to analyze the relationships between the grades and the grade adjustment factors. The results revealed that the approach grade at an intersection has a significant impact on queue discharge rate and that impact is greater than what is indicated in HCM 2000.


  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 214-228
  • Monograph Title: Bridging the East and West: Theories and Practices of Transportation in the Asia Pacific

Subject/Index Terms

Filing Info

  • Accession Number: 01602236
  • Record Type: Publication
  • ISBN: 9780784479810
  • Files: TRIS, ASCE
  • Created Date: May 19 2016 3:02PM