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...
18.10 Complexity of Sign Information Sign complexity is measured by counting the number of information units contained on a sign. Table 18.5 captures the effects of information complexity on motorists. An information unit can describe features such as road type, event...
18.8 Driver Comprehension of Signs Signs must be designed and located so that road users can easily see and interpret their messages. Table 18.4 presents guidelines for to improve the legibility, recognition, and interpretability of three sign formats. Table 18.4...
18.6 Conspicuity of Diamond Warning Signs Under Nighttime Conditions Visual conspicuity refers to how easily road users can locate a visual target. When motorists can identify signs easily, they have more time to process information found on the signs and react...
18.4 Sign Design to Improve Legibility While road designers are not responsible for designing signs, they do review signing plans. As such, understanding methods for improving sign legibility is helpful for verifying that all signs installed along a route are readable...
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...
