The road side data exchange net includes a plurality of {TAIL ~ road side data exchange devices} set on {HEAD ~ neighboring roads} separately 
The road side data exchange net includes a plurality of { TAIL ~ road side data exchange devices } set on { HEAD ~ neighboring roads } separately
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH