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Required Stopping Sight Distance on Crest Vertical Curves
Journal of Transportation Engineering, 2001Required stopping sight distance (SSD), used to calculate the minimum rate of vertical curvature or the minimum length of a crest vertical curve (CVC), is usually calculated on the assumption that the grade of the braking section is zero (G = 0). This assumption is not the worst case and may lead to the selection of a CVC on which there is a segment ...
Ioannis Taignidis, George Kanellaidis
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A review of stopping sight distance in road design guidelines
Proceedings of the Institution of Civil Engineers - Transport, 2013A fundamental principle of international road geometric design guidelines and handbooks is that along a roadway, the available sight distance should be sufficient to enable a driver, travelling at a reasonable speed, to stop before reaching a stationary object on his path.
Nikolaos Roussiamanis +3 more
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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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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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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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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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Unalerted perception-reaction time and emergency stopping sight distance for people riding bicycles
Motivated by climate change and increasing emissions from the transportation sector, government initiatives aim to shift travel away from automobiles to other modes such as bicycling. Despite broad agreement that high-quality infrastructure is critical to attracting and safely accommodating active travel, current design procedures for bicycle ...
Martin, Stephen Michael
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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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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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Balancing Urban Driveway Design Demands Based on Stopping Sight Distance
Transportation Research Record: Journal of the Transportation Research Board, 2009Many roadways in urban areas, especially dense commercial areas, are subjected to on-street and adjacent off-street parking demands; local access through driveways is an essential component of these complex urban corridors. Vehicles entering and exiting these driveways–-and their interaction with parked cars, other moving motorized vehicles, bicycles ...
Karen Dixon +2 more
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