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Safety Evaluation of Permanent Raised Pavement Markers (2004) / Chapter Skim
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Pages 40-43

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From page 40...
... Therefore, any change in lane position at night with snowplowable PRPMs is expected to result from improved delineation. Kallberg (42)
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From page 41...
... These changes in driver behavior are expected to have the following impacts in turn: • Decreases in nighttime head-on crashes, with increasing benefits as traffic volumes increase; • Decreases in safety benefits as the degree of curvature increases; • Decreases in safety benefits as the vehicle moves closer to the edgeline; • Decreases in wet weather nighttime crashes; • Slight decreases in daytime wet weather crashes; and • Less positive effects of PRPMs on gentle curves and less negative effects on sharp curves on roads with illumination when compared with roads without illumination. 5.1.2.1 Decreases in Nighttime Head-On Crashes, with Increasing Benefits as Traffic Volumes Increase The majority of head-on crashes are due to inadvertent excursions into the oncoming lane (only 4 percent of headon fatalities are associated with overtaking)
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From page 42...
... 5.1.2.5 Slight Decreases in Daytime Wet Weather Crashes Snowplowable PRPMs may improve daytime visibility under wet weather conditions because of the profile of the PRPM housing above the film of water covering the painted markings. This improvement in visibility might contribute to a decrease in daytime wet weather crashes.
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From page 43...
... Table 3-25 shows that 53 percent of four-lane freeways in Missouri have shoulder rumble strips compared with 38 percent of Pennsylvania freeways. 5.2.2.3 Decreases in Wet Weather Crashes The results of the composite analysis indicated that snowplowable PRPMs were effective in reducing wet weather crashes in four-lane freeways in Missouri (12.8 percent)
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Key Terms

  • lane position
  • time crashes
  • nighttime crashes
  • significant increase
  • wet weather

  • nonsignificant decrease
  • weather crashes
  • safety performance
  • total crashes
  • driver speed

  • rumble strips
  • daytime wet


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