Threshold determining {HEAD ~ means} determines a velocity threshold value functionally related to {TAIL ~ the crash displacement value} 
Threshold determining { HEAD ~ means } determines a velocity threshold value functionally related to { TAIL ~ the crash displacement value }
OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL