Thus, in {HEAD ~ an uneven grid} of {TAIL ~ streets}, the velocity may vary from block to block in accordance with the length of the fastblocks 
of
Thus , in { HEAD ~ an uneven grid } of { TAIL ~ streets } , the velocity may vary from block to block in accordance with the length of the fastblocks
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH