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Rodger J. Koppa
Researcher at Texas A&M University
Publications - 29
Citations - 582
Rodger J. Koppa is an academic researcher from Texas A&M University. The author has contributed to research in topics: Poison control & Stopping sight distance. The author has an hindex of 12, co-authored 29 publications receiving 546 citations. Previous affiliations of Rodger J. Koppa include Texas A&M University System & Texas A&M Transportation Institute.
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Journal Article
Determination of stopping sight distances
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).
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Driver Perception-Brake Response in Stopping Sight Distance Situations
TL;DR: In this paper, the authors measured driver perception-brake response to several different stopping sight distance situations and found that the 95th percentile perception braking response times for these same conditions were 2.0 s.
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Driver Braking Performance in Stopping Sight Distance Situations
TL;DR: In this paper, the authors measured driver braking distances and decelerations to both unexpected and anticipated stops and found that ABS results in shorter braking distances by as much as 30 m at 90 km/h.
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Effects of Horizontal Curvature on Driver Visual Demand
TL;DR: Visual demand was found to be a promising measure of effectiveness for use in studies of design consistency and it was found that small changes in visual demand were found between types of curve pairs with differing spacing between the curves.
Journal Article
A new stopping sight distance model for use in highway geometric design
TL;DR: This model is based on parameters describing driver and vehicle capabilities that can be validated with field data and defended as safe driving behavior and results in stopping sight distances, sag vertical curve lengths, and lateral clearances that are between the current minimum and desirable requirements and crest vertical curves that are shorter than current minimum requirements.