11.2 Engineering Countermeasures to Reduce Red Light Running Factors that influence the likelihood of drivers running red lights include traffic volume, cycle length, advance detections for green extension, speed, signal coordination, yellow interval duration,...
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...
9.2 Perceptual and Physical Elements to Support Rural-Urban Transitions When motorists driving at a high speed enter an area with lower speed limits, they tend to underestimate their speed and not adjust it downward enough. The design of transition zones needs to...
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...
7.4 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...
