The barriers have a lost motion aspect whereby if {HEAD ~ a user} is located in {TAIL ~ the deployment path} and obstructs the deployment of the barrier, for example, the barrier moves up to the obstruction and stops against it while the lift can continue to move 
The barriers have a lost motion aspect whereby if { HEAD ~ a user } is located in { TAIL ~ the deployment path } and obstructs the deployment of the barrier , for example , the barrier moves up to the obstruction and stops against it while the lift can continue to move
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH