MASH TL4
MASH Test Level (TL) 4 safety barriers are capable of withstanding higher impact severity levels than TL3 barriers. The single unit box truck places additional demand on barrier performance in order to prevent rollover. The selection of a TL4 barrier is often preferred on roadways with a higher percentage of heavy vehicles. The TL4 impact is performed with a 10,000kg rigid truck traveling at 90km/h and 15 degrees. Â
Barrier complying with MASH TL4 are typically higher and stiffer than barriers complaint with MASH TL3.Â
The higher mounting position of the thrie-beam guardrail improves the system’s ability to contain and redirect large vehicles.
CrocGuard is a revolutionary bridge & culvert barrier spanning up to 16m between abutment posts.
An engineered solution for attachment to RamShield High Containment for installations on the hinge point of weak batters.
The DeltaBloc designs feature a unique tension bar and coupling system providing lateral support during a vehicle collision.
SafeZone is a smooth faced temporary barrier system, anchored to asphalt or concrete pavement in verge or median applications.
Sentry Thrie-Beam has advanced the containment level of thrie-beam guardrail by introducing innovative technology into the thrie-beam guardrail release mechanism.
Sentryline-M provides safe vehicle containment and redirection, utilising the tensile strength of tensioned wire rope cables supported by steel posts.
TALL42 is a freestanding, movable concrete barrier system designed to be used with a transfer machine that can reposition the barrier, altering the traffic lane configuration.
Featuring a triple rail design, VGAN 400 is manufactured from lightweight, special grade aluminium providing safe vehicle containment.
Frequently Asked Questions
What is the MASH TL4 crash testing?
MASH TL4 evaluation requires three (3) crash tests:Â
- 1100kg passenger car travelling at 100km/h and 25 degrees.Â
- 2270kg pick-up truck travelling at 100km/h and 25 degrees.Â
- 10,000kg rigid truck travelling at 90km/h and 15 degrees.Â
What is the purpose of the 1100kg passenger car test?
For small cars, the primary concerns are the potential for vehicle under-ride, wheel snag, rollover, and head-slap.Â
Is MASH Test Level 4 used for the crash test evaluation of guardrail end terminals and crash cushions?
No. MASH TL4 is used to evaluate longitudinal barriers only, including guardrails and wire rope barriers. The upper test level for the evaluation of end terminals and crash cushions is MASH TL3.Â
What are the general characteristic of MASH TL4 longitudinal barriers?
Since MASH TL4 barriers must contain and redirect the 10,000kg rigid truck, they are typically stronger and taller than MASH TL3 compliant barriers.Â
What is the working width of a road safety barrier?
Working width is the maximum distance from the traffic-side face of a road safety barrier to the farthest point reached by any part of the system or vehicle during impact. It includes both the barrier’s dynamic deflection and the vehicle roll or sway allowance, ensuring the barrier and vehicle remain clear of the hazard being shielded.Â
What is the difference between Dynamic Deflection and Working width?
Dynamic deflection is the maximum lateral displacement of the barrier during a vehicle impact and is typically specified when shielding batter slopes, culverts or where the hazard is low enough that it does not interfere with the possible vehicle intrusion into the area behind a barrier. The working width is the minimum distance required to prevent an impacting design vehicle from colliding with an object behind a barrier system. This includes both the dynamic deflection of the barrier and the extra width to allow for the roll (vertical rotation) of an impacting vehicle. Working width is an important design consideration when shielding above-ground fixed hazards such as trees, sign supports or bridge piers.Â
How is the working width of a MASH TL4 impact measured?
In most crash tests, the 10,000kg single unit truck will exhibit vehicle roll during containment and redirection. Working width is therefore measured to the top of the cargo box. Â
What is the height of the cargo box?
The height of the cargo box is often variable between makes and models. Typically, ASBAP requests the working width of a 4.3m high cargo box.Â
