This document describes a dynamic dual-task method that quantitatively measures human-performance degradation on a primary driving-like task while a secondary task is being performed. The performance measures of the method indicate the visual-manual and cognitive secondary-task demand associated with visual-manual or auditory-verbal secondary task engagement while driving.

This document defines key terms and parameters for the assessment of BT + DRT. It provides guidelines and minimum requirements on equipment and procedures to plan evaluation trials, specify (and install) data capture equipment, conduct a study, analyse, interpret, and report metrics indicating visual-manual and cognitive secondary-task demand using the BT + DRT.

The metrics and definitions described in this document provide a common source for the assessment of visual-manual and cognitive task demand induced by different IVIS while driving. The BT + DRT is applicable to standardized experiments in laboratory-based settings. Data collection and analyses according to this document allow comparisons across different secondary tasks.

In contrast, this document does not apply to the measurement of primary (driving) task demand. This document can be applied to both original equipment manufacturer (OEM) and after-market in-vehicle systems, and to permanently installed as well as portable systems.