Intelligent speed adaptation (ISA) refers to various concepts aiming at limiting the vehicle speed. In Umeaa, Sweden, a large scale field study was carried out to test the possibility to, on a voluntary basis, install one type of ISA device in private vehicles. In this study 10,300 car owners were contacted by telephone and offered to have an ISA device installed in their car. This paper reports on drivers' attitudes to four different ISA-applications and on factors influencing the decision to install the one type of ISA, an electronic speed checker (ESC). The results show that approximately 40% of the respondents accepted the offer to have an ESC installed in their vehicle. The analysis indicated that age, perceived risk, moral and perceived difficulty to keep the speed limits significantly influenced their evaluation of the ESC and that the perception of the ESC influenced the decision to participate. (Author/publisher).
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