On National Highway 53 in India, a TTMA-200 had about three seconds to prove itself. The proof, however, was established years earlier, on a test range, under conditions harsher than almost anything the road can produce.
This is what stands behind the phrase MASH 2016 TL-3 tested.
What MASH 2016 Test Level 3 means
The Manual for Assessing Safety Hardware (MASH 2016), published by AASHTO, defines how work zone protection equipment is crash tested. Test Level 3 means impact speeds of roughly 100 km/h, using vehicles that reflect what actually drives on modern roads: a 1,097 kg small car and a 2,268 kg pickup truck. MASH 2016 also made offset and angled impacts mandatory, because real drivers swerve before they hit.
Five impacts, five controlled stops
The TTMA-200 passed every required test, plus one more:
- Test 3-50: small car, 99.68 km/h, centreline impact
- Test 3-51: pickup truck, 103.18 km/h, centreline impact
- Test 3-52: pickup truck, 101.37 km/h, one-third offset impact
- Test 3-53: pickup truck, 102.18 km/h, angled at 10 degrees
- Test 3-54: intermediate car, 107.19 km/h, centreline impact
Five impacts, five controlled stops, carried out at Applus IDIADA KARCO. Beyond the standard, the TTMA-200 also passed a voluntary worst-case test with the towing truck locked against all movement at 100 km/h, so the attenuator alone had to absorb the full impact energy.
How the energy disappears
Inside a TTMA-200 there is no crumple foam and no hydraulics. There is a patented tube-bursting design: on impact, an oversized mandrel is forced into a slightly narrower tube, splitting it into four steel straps. Splitting steel consumes enormous energy in a controlled, predictable sequence, and the straps stay attached to the trailer, so nothing is thrown into surrounding traffic.
From test range to public roads
The test record translated into third-party recognition: FHWA eligibility CC-152 in the United States and Trafikverket approval TRV 2020/78913 for state-maintained public roads in Sweden.
And in the end, it translated into 40 road workers going home on NH-53. Read the full story in our case study: Life-Saving Impact: TTMA-200 Prevents Major Accident on NH-53.
More about the standard: What is MASH 2016?