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...
5.12 Influence of Speed on Sight Distance When operating speeds are much faster than design speed, increasing sight distance to account for higher vehicle speeds can be a good option. Table 5.8 summarizes how different aspects of a road’s design influences operating...
5.8 Determining When to Use Decision Sight Distance Decision sight distance is longer than stopping sight distance. Its use is appropriate in road environments where motorists (a) make complex or instantaneous decisions, (b) have difficulty perceiving information, or...
5.4 Determining Stopping Sight Distance Stopping sight distance is the distance a motorist traveling at a particular speed needs to stop their vehicle once they detect an object on the road. To determine stopping sight distance, use actual operating speeds if they are...
