Which of these is NOT an acceptable approach guardrail end?

Answer: C — Wooden end posts

In the context of highway safety and bridge management, acceptable approaches for guardrail end treatments are pivotal to ensuring the safety of vehicles that may impact the ends of guardrails. The correct answer pertains to an option that does not meet safety standards. Wooden end posts are not considered an acceptable approach guardrail end because they lack the necessary structural integrity and crashworthiness required for modern highway safety. Unlike other options which are designed to absorb impact and redirect vehicles in a safe manner, wooden end posts can splinter or break upon impact, leading to an increased risk of injury to occupants of the vehicles. In contrast, the other guardrail end treatments, such as sequential kinking terminals and redirective non-gating crash cushions, are specifically designed to manage the impact forces effectively. These structures help to mitigate damage and facilitate safer vehicle redirection upon collision with the guardrail. Therefore, the inclusion of wooden end posts is inconsistent with current safety guidelines and practices aimed at minimizing harm during vehicular accidents.