ABSTRACT
Four systems to reduce driver speed on curves were developed and tested on a driving simulator. Their effect on driver performance was evaluated in terms of curve approach and negotiation. As expected, automatic speed control surpassed all the other systems in terms of effectively reducing speed on approach to curves and consequently having additional positive effects on lateral control in curve negotiation. In terms of user acceptability however, this system was least liked. There were found to be very few differences between the remaining advisory systems. It appears that the provision of advice, in any format, could be effective in reducing speeds.
