Thank you, Adi. That's roughly the info I gathered so far.
But still, a little video would speak a thousand words. Right now, I, without access to a wave owner, don't have any clue how significant the visual impact of this device can be...
Oh, that's not my video, don't have the wave yet. I was curious about the helix but having heard that it's not very reliable and given that the wave comes from Christian Betz I'll rather go this route, even though it doesn't have a "high to low mode" range.
...looks like someone`s already using it at the EM:
http://image.stern.de/6915758/16x9-940-529/5936ebefbdfde92f2fc8907eb2622c36/Vx/island---kommentator---video---netzhit.jpg
The guy who did that video explained on his website that the bridge is 100 years old and wasn't built with that height clearance in mind. To protect the bridge those yellow lights and a steel beam had been installed, that's what these trucks are grinding into.
Regarding my original video: I really wonder if these people ever took a moment to take a look at their invention and judge for themselves if this is A ) practical and B ) the most stupid looking thing that ever entered a movie set...
The guys in charge must be in some contracts with AC manufacturers and workshops, otherwise I can`t understand why they seem to not give a f*** about that bridge being crashed over and over. What does that mean for stability of that bridge anyway...