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4、friversinhlf.However,trffioftenreturnstofullspeewithinmonthssriverseomeusetoseeingthepinters.hevrons,sientistssy,notonlygiveriverstheimpressionthttheyrerivingfsterthntheyrellyreutlsomkelneppertoenrrower.Theresultislongerlstingreutioninhighwyspeenthenumeroftrffiients.1).Thepssgemi
5、nlyisusses__________..newwyofhighwyspeeontrol.newptternforpintinghighwys.newpprohtotriningrivers.newtypeofoptilillusion-----------------Ñ¡Ôñ£º2).Onrospintewithhevrons,riverstentofeeltht__________..theyshoulvoispee-reltehzrs.theyrerivinginthewronglne.theyshoulslowowntheirspee.they
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8、periooftime..Theyrepplileonlyonroros..Th
