Manual for Assessing Safety Hardware (MASH) presents uniform guidelines for crash testing permanent and temporary highway safety features and recommends evaluation criteria to assess test results.
MASH ratings include TL-1, TL-2, TL-3, TL-4, TL-5, and TL-6 but the criteria to achieve the ratings have been updated since the use of NCHRP reports. Each rating shows the size and speed of vehicles used in the tests. To achieve a rating, the physical crash test of a potential traffic safety device must have met specific criteria regarding where the car ended up, how it got there and what kind of damage occurred.
TL-1: Cars and trucks –– 31 mph
TL-2: Cars and trucks –– 44 mph
TL-3: Cars and trucks –– 62 mph
TL-4: Cars, trucks, and single unit trucks –– 62 mph and 56 mph respectively
TL-5: Cars, trucks, and tractor trailers –– 62 and 50 mph respectively
TL-6: Cars, trucks, and tractor tank trailers –– 62 and 50 mph respectively