10. The audible alarm shall sound if:
(a)any barrier is horizontally dislocated when in the fully-lowered position;
(b)the main power supply fails;
(c)all the red traffic light signals facing in one direction fail.
10. The audible alarm shall sound if:
(a)any barrier is horizontally dislocated when in the fully-lowered position;
(b)the main power supply fails;
(c)all the red traffic light signals facing in one direction fail.