Abstract
A variety of crash avoidance systems (CAS) technologies are currently under development or are already on the market. Evaluation of such technologies from a human factors standpoint is both urgent and complex. In this article I present a number of issues to which a comprehensive evaluation of CAS technologies should be addressed for lane change crash avoidance. These issues are posed in the form of a set of general questions within which methodological considerations are discussed and data needs are identified. Although the lane change crash problem is used as a focal point for discussion, the issues outlined in this article are considered fundamental to CAS evaluation in general.