Guidelines for Cost-Effective Safety Treatments of Roadside Ditches (2021) / Chapter Skim
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38 CHAPTER 3. SURVEY OF STATES INTRODUCTION TTI researchers developed a list of survey questions to identify innovative treatments of roadside ditches that may not have been previously documented.
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39 Determining Barrier Need and Slope Combinations How does your state determine if a barrier is warranted in front of a roadside ditch? Of the participants responding to the survey, 77% said they use the AASHTO RDG to determine if a barrier is warranted in front of a roadside ditch, while 36% use another source, primarily standards developed in their respective states.
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40 Figure 3.2. Type of ditch typically used.
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41 Figure 3.4. Ditch configuration for typical nonsymmetric ditches.
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42 Figure 3.5. Typically used foreslopes.
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43 common method used is to install a closed drainage system to replace the ditch. Another common practice is placing a curb-and-gutter system.
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44 Figure 3.8. Types of surface treatments used.
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45 Figure 3.9. Use of ditch paving.
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