System Responses Available for Evaluation

The evaluation of measures, which are active during the pre-crash phase, includes all possible system responses. As those systems are subject to a variety of uncertainties (e.g., due to limitations of the sensors, variability in the situation when making predictions, etc.) they will not work ideally [2]. That means they will produce unintended side effects together with the intended effects they can be visualized using a classification matrix [3] as given in Table2.1. 

There are two categories of intended as well as unintended responses with respect to the objective danger of the specific situation. The intended actions are the following  

Objective danger Yes True positive Ftilse negative 

The intended actions are explained straightforward regarding the objective of the system. If necessary, it should do what it is specified to do (i.e., true positive) and otherwise should not act (i.e., true negative). The unintended actions are grouped into  

The quality of a measure with respect to traffic safety can thus be evaluated using this abstract scheme. The sensitivity (also called right-positive rate (RPR)), defined in Eq. 2.1, gives the conditional probability that a positive (i.e., objectively dangerous) situation is treated by the system accordingly [3]. 

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