The posts 64 can be further designed as {TAIL ~ bumpers} against {HEAD ~ accidental truck impact} 
The posts 64 can be further designed as { TAIL ~ bumpers } against { HEAD ~ accidental truck impact }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD