Designers may occasionally be constrained with respect to the lane arrangements, geometry, or design vehicle that can be accommodated. Mitigation efforts may include placing roadside objects (lights, sign poles, signals, etc.) farther from the edge of pavement so large vehicles do not collide with them. The use of mountable or painted end treatments on raised barriers provides more room for encroachments.

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More Information: https://bookstore.transportation.org/collection_detail.aspx?ID=31