Interchanges are freeway design features that pose considerable safety and operational
problems for drivers. Most freeway accidents and directional uncertainty occur in the vicinity
of interchanges. Reasons for this phenomenon include friction between entering and exiting
traffic, variability in design, and a high probability for driver error, the primary contributing
factor of accidents. An introduction of general human factors considerations in highway
design is presented; it is intended for highway engi-neers unfamiliar with the science of …