| Summary: | This article presents the results of a ex-ante impact assessment study of Advanced Driver
Assistance Systems. It focuses on two systems supporting longitudinal driving tasks, namely
Autonomous Intelligent Cruise Control and Intelligent Speed Adaptation (ISA). The article
addresses and compares the impacts of these systems on efficiency, reliability, driving
comfort and safety by micro-simulation, for different penetration levels and bottleneck layouts.
The analysis reveals that deployment of cruise control improves bottleneck capacity, while
on the contrary, the bottleneck reliability generally reduces. The impact on traffic safety is
undetermined, and the cruise control has a negative impact on driver comfort. ISA has no
considerable effect on capacity. Also, no substantial contribution to the bottleneck reliability
could be established. The expected safety benefits of ISA could generally not be established
using the assessment methodology applied in this research.
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