Twelve pavement marking and delineation treatments were selected for field testing, primarily on the basis of the results of preliminary laboratory evaluations. With the exception of one treatment selected as a control, the treatments were expected to address deficiencies of older drivers.The treatments were tested on a closed, oval track test facility using test subjects. Two types of measures were used: recognition distance and visual occlusion time. The recognition distance measures were static tests done with pairs of subjects in a test vehicle. Visual occlusion trials were conducted with the subject driving the test vehicle. The test vehicle was instrumented and outfitted with an onboard computer to provide automatic data collection and avoid the need for manual data reduction.
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