12.2 Task Analysis of Driver Merging Behavior at Freeway Entrance Ramps Merging onto a freeway is a dynamic, challenging task fraught with crash risk. Motorists on the mainline and those who are attempting to merge onto the mainline identify gaps and modify their...
16.6 Rumble Strips Rumble strips are raised or grooved indentations on the shoulder or median. When a vehicle departs its lane and travels over rumble strips, motorists hear an audible alert and experience a vibrating sensation that warns their vehicle has departed...
8.4 Overview of Driver Alertness on Long Tangent Sections Drivers can become fatigued, bored, or less attentive on long tangent sections that impose few cognitive or visual demands. Consider using the countermeasures listed below on long tangent sections that prevent...
8.2 Task Analysis of Lane Changes on Tangent Sections In areas where lane changes are likely (e.g., interchanges, entrance and exit ramps, merge/weave sections) avoid incorporating design features that require motorists to read signs or engage in complex decision...
7.6 Preview Sight Distance and Grade Perception at Vertical Curves Preview sight distance measures the motorist sight distance required under the assumption they base their behaviors on a preview of the road surface and other cues that lie downstream. The concept...
7.4 Design Considerations for Turnouts and Grades Truck escape ramps provide a space for out-of-control trucks to slow down and stop away from through traffic. Table 7.2 lists design guidelines for geometrics and signing. Table 7.2 Guidelines for Geometrics and...
