Four-Lane to Three-Lane Conversions An Update and a Case Stu资料.pdf

文档介绍：Knapp and Rosales 1
3rd Urban Street Symposium
June 24-27, 2007 Seattle, Washington
Four-Lane to Three-Lane Conversions:
An Update and a Case Study


AUTHORS:
Keith K. Knapp Jennifer A. Rosales,
Associate Research Scientist Senior Professional Associate
Texas Transportation Institute PB, 400 SW 6th Avenue
TAMU 3135 Suite 802
College Station, TX 77843-3135 Portland, OR 97204
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone]
k-******@ Rosales@


ABSTRACT
A presentation at the first Urban Street Symposium promoted the more widespread consideration
and examination of four- to three-lane roadway cross section conversions. At the second Urban
Street Symposium a set of guidelines for their implementation, along with other relevant ongoing
pleted projects, were summarized. Several additional four- to three-lane conversion
analyses have pleted since that time. This paper summarizes some of the key text from
the conversion guidelines mentioned above and also presents the results of several recently
completed projects that add to the current state-of-the-knowledge in this subject area. The
feasibility determination factors for a potential four- to three-lane case study conversion location
are then described and evaluated. The factors of special interest along this case study roadway
were its desired and actual roadway function and vehicle speed, intersection operations and
design, business access, truck traffic, pedestrians, right-of-way availability, and a nearby parallel
railroad track. The characteristics of these and other factors are discussed and a list of
observations and lessons learned from this case study application are provided. Some of the
roadway factors and characteristics that should be considered early in the cross section
comparison process (before more detailed design, etc.) are noted.









Urban Street Symposium
June 2007
W