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Objectives: -Determine if rumble stripes can be used as a strategy to combat roadway departures and reduce the number of run-off-road (ROR) crashes. -Install edge line rumble stripes along the lane edge at a narrow width to avoid intruding on the normal vehicle travel path. -Evaluate and provide a preliminary assessment of the edge line rumble stripes' performance. -Evaluate the effectiveness of the rumble stripes for improving the longevity of the edge line markings.
TRB¿s National Cooperative Highway Research Program (NCHRP) Report 613: Guidelines for Selection of Speed Reduction Treatments at High-Speed Intersections explores the effectiveness of geometric design features as well as signage and pavement markings to reduce vehicle speeds at high-speed intersections.
Paved shoulders can help accommodate non-motorized vehicles, allow errant vehicles to recover, and effectively reduce crash numbers.
This report contains the Phase II effort on wet-night pavement markings, a benefit-cost analysis, and a study of contrast markings. Phase II effort consisted of expanding the study design from Phase I to include additional wet-night pavement marking products, the effects of glare and dry pavement on detection distances, and a benefit-cost analysis with respect to the use of different pavement marking systems to accommodate drivers under wet-night conditions.
TRB's National Cooperative Highway Research Program (NCHRP) Report 672: Roundabouts: An Informational Guide - Second Edition explores the planning, design, construction, maintenance, and operation of roundabouts. The report also addresses issues that may be useful in helping to explain the trade-offs associated with roundabouts. This report updates the U.S. Federal Highway Administration's Roundabouts: An Informational Guide, based on experience gained in the United States since that guide was published in 2000.