Improving Usefulness of Automated Driving by Lowering Primary Task Interference through HMI Design

Table 4

Behavioural observations during system manoeuvres; categories: (1) not distracted, (2) no reaction, continuation of NDRT, (3) short glance ahead, continuation of NDRT, (4) alternating of NDRT and looking ahead, (5) interruption of NDRT and looking ahead with magazine in hand, and (6) interruption of NDRT and looking ahead, putting magazine aside.

Condition	Interference level
	1	2	3	4	5	6	∑
Speech + generic	1	2	16	13	15	4	51
Generic	0	0	14	10	18	9	51
	1	2	30	23	33	13	102