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The purpose of this study was to investigate vehicle guidance through work zones by evaluating the effectiveness of two primary components of traffic control relative to delineation. First, a comparison of the steady-burn lights presently used on top of the temporary concrete barriers was made with experimental reflectorized panels. Second, the addition of closely spaced raised pavement markers as a supplement to the existing pavement markings was evaluated. The study was limited to work zones on interstates and four-lane highways. The results of this investigation have led to the recommendation that (1) steady-burn lights on temporary concrete barricades should be replaced with reflectorized panels fabricated with high intensity sheeting, and (2) closely spaced, raised pavement markers should be used as a supplement to existing pavement striping in areas where the roadway alignment changes.
The purpose of this manual is to provide clear and helpful information for maintaining gravel roads. Very little technical help is available to small agencies that are responsible for managing these roads. Gravel road maintenance has traditionally been "more of an art than a science" and very few formal standards exist. This manual contains guidelines to help answer the questions that arise concerning gravel road maintenance such as: What is enough surface crown? What is too much? What causes corrugation? The information is as nontechnical as possible without sacrificing clear guidelines and instructions on how to do the job right.