The aim with the pilot study was twofold. Firstly, to examine if the VTI
driving simulator with its restraints is suited for this kind of studies.
Secondly, to describe to what extent the condition of the road surface
influence the driver behaviour. The study was confined to studying driver
behaviour on rutted roads, where the ruts were on a level with the
surrounding road surface, but where noise and vibrations increased obviously.
The study shows small but often significant differences in driving behaviour
as well as subjectively assessed effects. No difference in mean speed can be
established; however, the speed variance is greater for the rutted road. The
mean values of lateral position differ very little between rutted and smooth
road; however, subjects tended to avoid driving in the ruts. On the smooth
road they drove a long stretch with a lateral position corresponding to the
position of the ruts. Neither for self-reported work load nor for
self-reported effort is there any significant difference between rutted or
smooth road. The assessment of how difficult the driving task was, however,
showed significant differences: rutted road was generally considered as more
Linköping: Statens väg- och transportforskningsinstitut., VTI meddelande 940 , 2003.
Swedish, Sweden, Rutting, Driver, Behaviour, Simulator, Method, Speed, Side, Pavement, Vehicle handling