I had a chance to dig up the numbers you requested.
I reviewed our standard post spacing MGS length of need tests under MASH TL-3 impacts with the 2270P vehicle. I looked at the contact lengths and deformed length of the barrier for those tests. Contact length is the general length that the vehicle was in contact with the barrier. I also determined a deformed length which included the length of deformed rail and posts in the testing based on our damage documentation and review of the overhead film.
I reviewed three MGS tests with standard post spacings. Two steel post systems and a wood post system (SYP-1). Results are below.
Test No.
Vehicle Contact Length
(ft)
Length of Deformed Barrier
2214MG-2
33.7
50
SYP-1
23.1
43.75
ILT-1
39.92
As you can see, the contact length may vary somewhat, but the deformed length of the barrier system is pretty consistently around 50’. This would probably serve as a relatively good estimate for damaged system length for a TL-3 impact.
For MGS special applications like long-span guardrail or MGS adjacent to slopes, that distance may increase significantly. Other systems like MGS over curb or with reduced post spacing may have shorter deformed lengths.
Let me know if that answers your question.
Some parts of this site work best with JavaScript enabled.