The end supports can allow {HEAD ~ the extended barrier member} to move in {TAIL ~ a direction} transverse to the width of the barrier member when desired 
to move in
The end supports can allow { HEAD ~ the extended barrier member } to move in { TAIL ~ a direction } transverse to the width of the barrier member when desired
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH