14.10 Countermeasures to Reduce Gate Rushing at Crossings with Two-Quadrant Gates Gate rushing occurs when a motorist (a) drives under gate arms that are being lowered or (b) drives around lowered gates. Several countermeasures are available to discourage gate...
14.4 Driver Information Needs at Passive Rail-Highway Grade Crossings When only passive warning devices are installed at a rail-highway grade crossing, motorists need good information to determine whether a train is approaching. Verify the following information is...
14.2 Task Analysis of Rail-Highway Grade Crossings Traffic control devices play a valuable role in warning motorists of downstream rail crossings. Table 14.1 lists compliance issues and guidelines that influence whether motorists stop when warned of impending trains....
13.12 Determining Work Zone Speed Limits Decisions about work zone speed limits need to account for road geometrics and the location of work zone features (e.g., lane closure tapers, work activity). If possible, keep work zone speed limits within 10 mph of normal...
13.10 Sign Legibility Factors that influence sign legibility include retroreflectivity, color, letter/number font, and location (e.g., roadside or overhead). Prismatic sheeting enhances sign retroreflectivity. Use of fluorescent colors increases sign visibility in...
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...
