20.4 Effectiveness of Symbolic Markings Horizontal signing is sign text painted on the road. It conveys information to drivers without requiring them to look away from the road. For maximum effectiveness, horizontal signs should consist of large, simple elements and...
20.2 Visibility of Lane Markings Motorists must be able to clearly see longitudinal lane markings to follow them. Lane markings are designed for a specific preview time, which is the amount of time motorists look ahead on the road. Both marking width and...
17.14 Speeding Countermeasures: Using Roadway Design and Traffic Control Elements to Address Speeding Problems Designers can wield their knowledge of geometric design features to encourage motorists to make safer decisions about vehicle speed. Using consistent...
17.12 Speeding Countermeasures: Communicating Appropriate Speed Limits Motorists purposefully or inadvertently driving over the speed limit increases crash risks. Despite motorists failing to comply with speed limits in many situations, it is important to clearly...
17.4 Speed Perception and Driving Speed Motorists can misperceive the speed at which they are traveling. Although speedometers indicate vehicle speed, often motorists rely on external cues (e.g., engine noise, vibrations, visual sensations elicited through highway...
17.2 Behavioral Framework for Speeding Factors related to the motorist, vehicle, road, and environment influence speeds at which motorists drive. Figure 17.1 reviews factors designers should focus on to select countermeasures that mitigate speeding. It is critical to...
