Regulation 19D

each lanyard of the harness securing a patron to the roller glider has a backup safety device so that, if any point on the lanyard fails, the harness continues to secure the patron to the roller glider;

only one patron rides the roller glider at a time, unless the roller glider has engineering controls in place to ensure that there is a sufficient distance, between patrons riding the roller glider, to avoid a collision;

the roller glider is installed with a braking system that decelerates the gliding mechanism of the roller glider and brings the gliding mechanism to a safe stop; and

the roller glider is installed with an additional braking system (such as an over‑travel restraint, a buffer or an additional brake) that —

will bring the gliding mechanism of the roller glider to a safe stop in the event that the braking system mentioned in paragraph (c) fails; and

does not require any action on the part of the patron.