In this paper, car drivers' acceptability of Intelligent Speed Adaptation (ISA) policymeasures is examined by reporting the results of a stated choice experiment conducted inthe Netherlands. Choices made between a base option 'no policy measure' and threepolicy measure options were observed, that is mandatory ISA and voluntary ISA, thelatter combined with either purchase subsidy or a yearly tax cut. Coefficients of theestimated Multinomial Logit model indicate to what extent the acceptability of the threeoptions varies when targeted at three different driver groups and combined with twodifferent ISA types. The results point out that acceptability in particular varies with targetgroup. Mandatory ISA targeted at speed offenders is the policy measure with the highestacceptability, when targeted at all drivers it has the lowest acceptability. Acceptability isaffected to a much lesser extent by ISA type. Restricting ISA increases acceptability forspeed offenders and decreases acceptability for professional drivers and all other drivers.Furthermore, the results suggest a preference for a voluntary ISA combined with apurchase subsidy rather than with a yearly tax cut. Finally, acceptability of ISA policymeasures is consistently higher for females than for males and higher in the older agegroups, which is in line with earlier research.
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