In terms of providing positive perceptual illusions to influence drivers during rural curve negotiation, three types of roadway delineators were investigated: post delineators, raised pavement markers, and transverse stripe pavement markings. Vehicle speed and lateral placement were studied as a function of curve geometry and delineator type, characteristics (e.g. size, colour), and geometry (e.g. number, lateral placement). The research included static and dynamic psychophysical laboratory testing in a simulated environment; field testing using jury techniques; field testing by road users; and exploratory testing using an instrumented vehicle to collect eye movement and control data. The following delineation systems were evaluated at different field sites: standard post delineators in ascending in/out and standard configurations, carsonite post delineators in a standard configuration with a large curve warning sign, three large chevrons in a standard configuration, life lite system (raised pavement markings), and transverse pavement stripes. It was concluded that delineation systems can positively modify driver behaviour on high-accident rural curves (i.e. reducing speed and correcting lateral placement). Long-term impact was much less than the "night after effect," suggesting adaptation by local drivers. Novel delineation systems are justified on two-lane rural curves with high nighttime accident rates where most victims are not local drivers. For the covering abstract of the conference see IRRD 268805.
Abstract