Kay Fitzpatrick

TL;DR: In this article, the relationship between design speed and operating speed is examined through a survey of the practice and a thorough analysis of geometric, traffic, and speed conditions, and the basis for recent changes in speed definitions in the American Association of State Highway and Transportation Officials' (AASHTO's) "A Policy on Geometric Design of Highways and Streets" (Green Book) and the "Manual on Uniform Traffic Control Devices" (MUTCD).

TL;DR: In this paper, several efforts were undertaken to predict operating speed for different conditions such as on horizontal, vertical, and combined curves; on tangent sections using alignment indices; on grades using TWOPAS model; and prior to or after a horizontal curve.

TL;DR: In this paper, the authors present guidelines for pedestrian crossing treatment at unsignalized crossings and propose modifications to the Manual on Uniform Traffic Control Devices (MUTCD) pedestrian traffic signal warrant.

TL;DR: In this paper, the authors used regression techniques to determine how selected variables affect operating speed on horizontal curves and straight sections, and found that posted speed limit was the most significant variable for curve sections and median presence and roadside development were significant for straight sections.

TL;DR: In this article, the authors describe the development of recommended revisions to the stopping sight distance (SSD) design policy that appears in portions of Chapters II and III of the 1994 American Association of State Highway and Transportation Officials (AASHTO) publication, "A Policy on Geometric Design of Highways and Streets" (referred to as the Green Book).