This study was designed to validate simulator-study
results concerning driving speeds with three different
delineator post configurations based on post frequency.
The distance between delineator posts was 25-50 m on
curves and 50-100 m on straight road segments; in one
configuration there were no delineator posts on the
The test configurations were each installed on a specific
road segment for about 2 weeks. During this time speed
and lateral position of passing vehicles were measured at
several sites along the road. Acceptance of these three
delineator post configurations was examined in the lab by
asking volunteers to compare nighttime pictures.
Nighttime spot speed with delineator posts was on average
0.5 km/h lower than before delineator post installation.
Nighttime speed differences between delineator post
configurations were small. One of the three
configurations produced approx-imately 1 km/h higher
average speed than the other two, regardless of the road
curve radius at the measurement point. The results
differed significantly from those obtained with the
simulator: in the latter, delineator posts significantly
increased the speed, and the speed differences between
delineator post configurations were also substantial.
We found no statistically significant and consistent
relationship between delineator post density and lateral
positioning of vehicles. In the acceptance study, the
volunteers expressed a preference for high delineator
|Place of Publication||Espoo|
|Publisher||VTT Technical Research Centre of Finland|
|Number of pages||70|
|Publication status||Published - 2013|
|MoE publication type||Not Eligible|
- visual conditions