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Since the development of MASH in 2009, considerable effort has been made to provide DOTs with MASH-tested guardrail systems and address a multitude of application needs. Nonetheless, transportation agencies lack federal guidelines for addressing the non-standard guardrail applications often encountered during installation. Transportation agencies are left addressing these situations with special site-specific designs, including modifying a crash-tested guardrail or transition, or retrofitting guardrail applications to account for the safety of vulnerable road users. Join us for a review of current research to address these non-standard applications.