Additional investigations on driver information overload.

This report presents the findings of a research project to investigate the information load imposed on drivers from freeway signs and to develop a model to predict driver information load. The model has been incorporated into a software tool to help practitioners identify driver information overload problems and evaluate alternatives for sign locations. The report will be of particular interest to traffic engineers with responsibility for freeway sign legends and installations. (Author/publisher) This report may be accessed by Internet users at http://gulliver.trb.org/publications/nchrp/nchrp_rpt_488a.pdf