The objective of this project was to determine the minimum length-of-need of a Midwest Guardrail System (MGS) without downstream anchorage required to provide MASH compliant redirected behavior. In pursuit of this objective, the research team performed computer simulations to predict the minimum length-of-need prior to full-scale crash testing. After a crash test which failed to meet project objectives, the research team improved the predictive capability of the simulations by improving the modeling of the guardrail bolt head and rail slot interaction. Following the improved modeling effort, the minimum length-of-need was again predicted through computer simulation. The research team then investigated a reduction in this length-of-need by including guardrail washers on the downstream end posts. This system was then evaluated through full-scale crash  testing, but again failed to meet the project objectives. Consequently, the research team prepared recommendations for future research efforts. This report documents the efforts discussed above and the resulting recommendations for future research.