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,...
10.10 Sight Distance at Right-Skewed Intersections When a vehicle crosses a major road from a right-skewed minor road, the motorist has an unobstructed line of sight over their left shoulder. But some drivers may not be able to turn their bodies to take advantage of...
10.4 Factors Affecting Acceptable Gap Distances Many factors influence acceptable gap distance. When making assumptions about acceptable gap distance, it is important for designers to keep in mind issues summarized in Table 10.2 Table 10.2 Factors that Influence...
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...
