TY - BOOK AU - Transportation Research Board AU - National Academies of Sciences, Engineering, and Medicine TI - Guidelines for Guardrail Implementation DO - 10.17226/14273 PY - 2009 UR - https://nap.nationalacademies.org/catalog/14273/guidelines-for-guardrail-implementation PB - The National Academies Press CY - Washington, DC LA - English AB - TRB’s National Cooperative Highway Research Program (NCHRP) Report 638: Guidelines for Guardrail Implementation explores guidance on selecting the appropriate barrier performance level for the installation of longitudinal barriers.The following appendices to NCHRP Report 638 are only available online.• Appendix A, Guardrail Use Guidelines for Benefit/Cost = 2• Appendix B, Guardrail Use Guidelines for Benefit/Cost = 3• Appendix C, Guardrail Use Guidelines for Benefit/Cost = 4• Appendix D, Guardrail Use Guidelines for Benefit/Cost = 1 ER -