18.2 General Principles for Sign Legends Motorists have trouble seeing and processing signs that have too much content or whose messages are too complex. Sign legends must be concise and worded to maximize the comprehension of information presented. Use text-based...
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...
17.8 Effects of Posted Speed Limits on Speed Decisions Researchers have found that most motorists exceed posted speed limits. Motorists exceed speed limits for several reasons: (1) they believe speeding carries little risk; (2) they usually drive at what they perceive...
17.6 Effects of Roadway Factors on Speed Geometric, environmental, and traffic-related variables all influence driving speed under free-flow conditions on tangents. Drivers of free-flowing vehicles can select speeds based on their level of comfort and the appearance...
