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