This paper presents an impact assessment of enhanced safety by Advanced Cruise Control (ACC) systems. The objective of our study is to assess of the enhancement of the driving safety between with and without the ACC system. For the impact assessment of the ACC system, the system performance test data as well as the usual driving data should be used to assess direct and indirect safety impacts.

Therefore the proposed methodologies were developed by using the collected data from the Field Operational Test (FOT) and the evaluation scenario based test for conducting the safety impact assessment of the ACC system.

First, 5 vehicles equipped with ACC system will take part in the field operational test so that we can make the FOT database. By using the collected database, Changes of crash risk between with and without ACC system are used to quantify the impact of the ACC system.

Second, to make up for the missed the FOT data, test scenario based ACC performance test was conducted. From the scenario based test, system’s physical performance in the specific driving situations can be evaluated.

Finally, impact assessment of the ACC system can be obtained by combining FOT based analysis and scenario based test results. By using the proposed assessment methods, the impact assessment with respect to impacts on safety by the ACC system can be assessed scientifically.