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