Results 211 to 220 of about 2,930 (242)
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Driver Braking Performance in Stopping Sight Distance Situations
Transportation Research Record: Journal of the Transportation Research Board, 2000Assumed driver braking performance in emergency situations is not consistent in the published literature. A 1955 study stated that in an emergency situation “it is suspected that drivers apply their brakes as hard as possible.” This idea differs from a 1984 report that states drivers will “modulate”their braking to maintain ...
Daniel B. Fambro +3 more
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Three-Dimensional Stop-Control Intersection Sight Distance
Transportation Research Record: Journal of the Transportation Research Board, 2006Intersection sight distance is an important design element. A stopped vehicle on the minor road needs sufficient sight distance to depart (cross, turn left, or turn right) safely, even though an approaching vehicle on the major road comes into view. Current AASHTO policy assumes that both minor and major roads are straight and intersect at right angles.
Said M. Easa, Zain A. Ali
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3D Calculation of Stopping-Sight Distance from GPS Data
Journal of Transportation Engineering, 2006Sight distance is a key element in highway geometric design. Existing models for evaluating sight distance are applicable only to two-dimensional (213), separate horizontal, and vertical alignments or simple elements of these separate alignments (vertical curve, horizontal curve).
Girish Nehate, Malgorzata Rys
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New Stopping Sight Distance Model for Use in Highway Geometric Design
Transportation Research Record, 2000Stopping sight distance is an important design parameter in that it defines the minimum sight distance that must be provided at all points along the highway. Thus, it influences geometric design values, construction costs, and highway safety. Stopping sight distance is defined as the sum of two components—brake reaction distance and braking distance ...
Kay Fitzpatrick, Daniel B Fambro
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Sight Distance for Stop-Controlled Intersections Based on Gap Acceptance
Transportation Research Record: Journal of the Transportation Research Board, 2000The current AASHTO policy for sight distance at Stop-controlled intersections is based on a model of the acceleration performance of a minor-road vehicle turning left or right onto a major road and the deceleration performance of the following major road vehicle.
Douglas W. Harwood +2 more
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Three-Dimensional Model for Stop-Control Intersection Sight Distance
Journal of Transportation Engineering, 2004Intersection sight distance (ISD) is the distance to be provided at intersections between minor and major roads. Current AASHTO policy provides an equation and charts for the required at-grade ISD so that a driver on the minor road can depart (crossing, turning left or right) safely, even though an approaching vehicle on the major road comes into view ...
Said M. Easa +2 more
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The Stopping Sight Distance Test for Freeway Based on the Operating Speed
Applied Mechanics and Materials, 2011In this paper, the stopping sight distance of passenger car based on the operating speed was regarded as guideposts, and its corresponding radius of horizontal curve and vertical curve was got according to the calculated results, and available for reference and application in the alignment design and safety evaluation for freeway.
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Safety Effects of Limited Stopping Sight Distance on Crest Vertical Curves
Transportation Research Record: Journal of the Transportation Research Board, 2000Previous studies that examined the relationship between stopping sight distance and safety have been inconclusive and inconsistent; however, the fact that a relationship has not been established does not necessarily imply that stopping sight distance is not a contributing factor in some crashes.
Kay Fitzpatrick +2 more
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Aspects of Stopping-Sight Distance on Crest Vertical Curves
Journal of Transportation Engineering, 1998In the present study a simple methodology is developed, by which the values of available sight distance, for any driver location on crest vertical curves (CVCs), can be precisely and directly calcu...
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Operating Speed on Crest Vertical Curves with Limited Stopping Sight Distance
Transportation Research Record: Journal of the Transportation Research Board, 2000Horizontal and vertical elements of a highway are designed based on an assumed design speed. This concept was developed in the 1930s as a mechanism for designing rural alignments to permit most drivers to operate uniformly at their desired speed. In 1938, AASHO recognized that drivers select a speed influenced by the roadway environment instead of an ...
Daniel B. Fambro +2 more
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