An empirical study to determine guidelines for optimum timing ofroute guidance instructions

摘要

For a route guidance system to be acceptable to drivers it mustnmeet their expectations, based on their previous navigation experience.nAlso, the system output to the driver should be designed in such a waynas to maintain or improve current levels of safety. Most certainly, itnmust not be detrimental to safe driving as a result of driverndistraction, lack of confidence or erratic vehicle control. The topic ofnthis investigation-the appropriate timing of a route guidanceninstruction-is critical to system acceptability and safety. If anninstruction is given too early, the driver is likely to forget theninformation whilst attending to other driving tasks. If the instructionnis given to late, it will either cause the driver to brake suddenly ornto maintain safe driving but miss the manoeuvre completely. The authorsndescribe a study carried out to identify the factors which may affectntiming and, to select those which were the most important, those whichncurrent/future systems could detect/measure and those which the currentnstudy could control, select for or measure