Yes for safety
Because it has gotten to a point where no one has any common sense. Each square trampoline is pretty small so more than one person jumping at the same time can cause problems but it should also tell you something when they need a police officer there on Friday nights.
That is for the safety of the jumper . there is more control for those around the jumpers if it is one on a trampoline at a time.. They tell u that for the safety of those jumping
They tell you that so that the other person doesn't get hurt
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