Mash Tested 31-Inch Guardrail Implementation and Mash Implementation Dates

2015-4. December 29, 2015. This memo describes the MASH tested 31-inch Midwest Guardrail System (MGS) that CDOT will be using instead of the 28-inch guardrail. The factors and methods involved in raising or replacing existing guardrail, and implementation dates for other MASH tested devices.