Actually I think in this case being near another tall structure just makes the ride 'more potent'.
On the Star Flyer in Orlando you feel you are all too close to the nearby Slingshot and drop tower. On the Coney Island Vertical Swing you feel very close to nearby taller rides. On the Starflyer at Six Flags St. Louis, you're really not near anything else tall and while the view is spectacular you really loose something from not being near other tall structures.
The few I've ridden in Germany all released at the same time.
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Not to mention that in my opinion those belts are not strictly compliant with ASTM F 2291*. An out of reach release button or handle on the back of the seat would fix that.
I haven't ridden the Zamperla tower swing, but on the ARM version, the crotch belt (which secures the lap bar) plugs into a socket in the seat and is released electrically, or by means of a lever under the seat if that fails.
--Dave Althoff, Jr.
* That's also why new PTC trains now have a foot pedal to release the lap bars...
--DCAjr
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