Pure freedom I think . Grippatank’s is crash tested
I remember seeing a crash test (by which I mean a van with a Pure Freedom system crashing into a concrete block) by Pure Freedom on YouTube many years ago, but they never mentioned it on their website and the video cut off half way through, and there was no other information about it.
I thought Pure Freedom didn’t exist anymore having been absorbed into Window Cleaning Warehouse, though I do see they are claiming “crash tested” on the systems. Still no video or certification though. Personally I don’t think I would trust that without seeing the certification from whatever lab they are claiming their crash test was done.
And Grippatank systems are not “crash tested” they are “crash simulated” which is a significant difference.
A crash test is where you “crash” the vehicle. It is literally driven remotely at speed and “crashed” into a solid object to see how it performs. This was done by Ionic (of which you can see a plethora of videos) and Pure Freedom, (though I can’t find that video anywhere, but I definitely remember seeing it.)
Grippatank performed a Sled Test on their system, where the system is stationary on a movable ‘sled’ and a piston impacts the sled at a known speed.
This has the effect of SIMULATING a crash. But it is NOT a crash, since the vehicle has not been crashed. This is a a ‘crash simulation’.
(Interestingly, Ionic did several of these ‘crash simulations’ using sled tests before they performed the full crash-test as a way to develop their system).
These simulations are worthwhile, certainly better than nothing, but there’s a good reason that only actual crash TESTS are acceptable for standards such as Euro NCAP, because you only know how something is going to perform in a crash by actually crashing it, not just simulating it.
This distinction might become important if insurers decide only to cover “crash TESTED” systems.