13.8 Changeable Message Signs The purpose of changeable message signs is to communicate important messages succinctly. Keep display messages to a maximum of two phases. Avoid splitting information across phases, use a consistent format for calendar dates, and make...
13.2 Overview of Work Zone Crashes Young male motorists (ages 25 – 34) are most likely to be involved in work zone crashes. Knowledge of work zones and how they influence safety is valuable for reducing crash risk. Table 13.1 provides general guidance on structuring...
12.10 Arrow-Per-Lane Sign Design to Support Driver Navigation An arrow-per-lane sign is an overhead sign with two components: (a) arrows that point to individual lanes and (b) destination information positioned immediately above the arrows. Motorists use information...
12.8 Driver Information Needs at Complex Interchanges Design interchanges so they conform with motorist expectations. Violating expectations increases the amount of time a motorist requires to execute a task as well as the number of errors. Table 12.3 lists design...
12.12 Driver Behavioral Trends Based on Exit Ramp Geometry Exit ramps need to afford vehicles enough space to depart the main freeway lanes and enough distance to decelerate to a speed appropriate for the controlling feature of the ramp. Several design practices...
