▁ens ures ▁that ▁the ▁desired ▁l ane ▁is ▁clear ▁and ▁moves ▁the ▁R ear ▁Pil ot ▁Car ▁to ▁operate ▁in ▁the ▁now - clear ▁l ane . ▁The ▁R ear ▁Pil ot ▁Car ▁Oper ator ▁transmit ▁the ▁clear ▁l ane ▁avail ability ▁to ▁the ▁Load . ▁After ▁passing ▁the ▁obst ruction , ▁the ▁Le ad ▁Pil ot ▁car ▁Oper ator ▁inform s ▁the ▁Load ▁that ▁the ▁Le ad ▁Pil ot ▁car ▁is ▁now ▁operating ▁in ▁a ▁specific ▁l ane ▁as ▁it ▁passes ▁a ▁specific ▁land mark ▁or ▁building . ▁The ▁R ear ▁Pil ot ▁Car ▁Oper ator ▁ens ures ▁and ▁transm its ▁that ▁the ▁desired ▁l ane ▁is ▁currently ▁clear ▁and ▁moves ▁the ▁R ear ▁Pil ot ▁Car ▁to ▁operate ▁in ▁the ▁now - clear ▁l ane . ▁ ▁Typ ically , ▁the ▁edges ▁of ▁any ▁o vers ize ▁load ▁must ▁be ▁marked ▁to ▁make ▁them ▁visible ▁to ▁drivers . ▁During ▁day time ▁the ▁required ▁mark ing ▁is ▁usually ▁red ▁flags , ▁and ▁during ▁night ▁white ▁or ▁yellow ▁lights ▁may ▁be ▁used . ▁The ▁ha uling ▁vehicle ▁must ▁have ▁at ▁least ▁one ▁flash ing ▁am ber ▁light ▁in ▁the ▁front ▁and ▁back . ▁Sign s ▁( yellow ▁with ▁black ▁border ▁in ▁the ▁United ▁States , ▁red ▁and ▁white ▁diagonal ▁stri pes ▁in ▁the ▁EU , ▁and ▁red ▁and ▁white ▁vertical ▁stri pes ▁in ▁Canada ), ▁saying ▁" O vers ize ▁load " ▁must ▁be ▁put ▁in ▁the ▁front ▁and ▁back ▁of ▁the ▁vehicle . ▁ ▁A ▁Le ad ▁Pil ot ▁Car ▁may ▁follow