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