Abstract: This paper investigated the effect of grade dropping on students’ performance, engagement, and satisfaction. In three different engineering courses that were taught by the author, an optional second midterm exam was offered ...

Abstract: The current highway geometric design guide provides a method for calculating intersection sight distance at two-way stop-controlled intersections by assuming that a departing driver on the minor road that would start from ...

Abstract: This paper presents an improved model for pedestrian crossing time that is used to establish preliminary guidelines for lateral clearance needs on railroad-highway grade crossings. The improved model includes new elements ...

Abstract: The current geometric design guide in the US uses design values for the required lengths of acceleration lanes that are based on research studies conducted more than 50 years ago. Those design values need to be updated ...

Abstract: Intersection sight distance (ISD) is the sight distance to be provided at intersections between a minor road and a major road. Current AASHTO policy provides an equation and charts for the required at-grade ISD so that a ...

Abstract: Horizontal reverse curves are used in all types of highways either in mainline alignments or in freeway interchange ramps. At present, minimum radius requirements for reverse curves are determined based on vehicle performance ...

Abstract: Left-turn vehicles need sufficient sight distance to decide when it is safe to turn left crossing the lane(s) used by the opposing traffic. Current AASHTO policy recommends that the adequacy of sight distance for left turns ...