This Transportation Research Record contains 22 papers on human performance or simulation and visualization. Among the topics discussed are the following: crash involvement of young novice drivers; factors affecting the safety of young and older drivers; behavioral classification of passing maneuvers; in-vehicle text messages; measuring performance for the Federal Aviation Administration's safety oversight system; driver eye glance behavior during lane change decision, lane changes, and straight-ahead driving; driver fatigue, distraction, and performance; eye glance behavior during in-vehicle secondary tasks; multifunction interfaces in vehicles; interface workload of in-vehicle information systems; human-machine interface design for intelligent speed adaptation; an automated real-time driver warning system; fuzzy sets for evaluating driver perception of variable message signs; video advertising signs and traffic safety; message display formats of portable variable message signs; in-vehicle Global Positioning System data for evaluating deceleration at stop sign-controlled intersections; simulator evaluations of driving with vision impairments and visual aids; a driving simulator for work zone design; the application of visualization to transportation systems; a four-dimensional interactive visualization system for transportation management and traveler information; and virtual reality visualization of microscopic traffic simulations.