THE EFFECT OF ISA IN RELATION TO SPEED LIMIT CREDIBILITY

One of the most challenging areas for ITS to contribute to road safety is controlling speed behaviour. Speeding is still common practise on many roads and contributes to a significant number of crashes. An Intelligent Speed Assistance (ISA) aims to reduce speeding in a more or less intrusive manner. This is promising, however the acceptance of ISA systems is still very low. Another promising approach to reduce speeding is by improving the credibility of speed limits. A driving simulator study is conducted to investigate the effect of credibility, with or without using an open informative and warning ISA. The results show that both ISA and credibility of speed limits are effective measures to reduce speeding. Non-ISA users appear to be more sensitive for the credibility of speed limits than ISA users. With regard to the acceptance of the ISA system used in this study, the expectations were fairly positive than the experiences.