Recommended Guidelines for the Selection of Test Levels 2 Through 5 Bridge Railings (2021) / Chapter Skim
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185 The following section presents the recommended selection guidelines and the process for the application of the guidelines for the selection of MASH TL2 though TL5 bridge railings. A risk approach applicable to new construction, rehabilitation and retrofitting is recommended.
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186 by entering Table 68 or Figure 30 with the bi-directional construction year AADT from Step 1 and the highway type.
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187 reasonable. Penetrating the railing has the possibility of causing at least one non-motor vehicle injury or fatality.
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188 f. Regional concerns about snow removal, hydrological impact of flood waters flowing over the bridge, and maintaining scenic views may also play a role in the selection of bridge railings beyond these selection guidelines.
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189 Table 67. Encroachment Adjustments.
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190 Table 68. AADT – Lifetime Encroachments per 1,000-ft of Bridge Railing.
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191 Figure 30. AADT – Lifetime Encroachments/1,000-ft of Bridge Railing Nomograph.
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192 Figure 31. Minimum Horizontal Curve Radius Based on Barrier Obstruction to the Stopping Sight Distance Compared to AASHTO Exhibit 3-14.
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193 LOW MEDIUM HIGH Figure 32. Test Level Selection Nomograph (Risk<0.01 in 30 years for 1000 ft of bridge railing)
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