Dancing diamonds in highway work zones: Evaluation of arrow-panel caution displays
Detection and identification of light-emitting diode traffic signals by Protan observers
Driver understanding of pavement marking colors and patterns
Effect of variable-message signs in reducing railroad crossing impacts
Forecasting train travel times at grade crossings
Improving dilemma-zone protection of advance detection with advance-warning flashers
Nighttime expert panel and photometric evaluations of unlighted overhead guide signs
Reductions in traffic sign retroreflectivity caused by frost and dew
Supplemental pavement markings for improving safety at railroad-highway grade crossings