1999 GMC Sierra 1500 Pickup Owner's Manual - Page 186

Your Driving and the Road Traffic Lights AM402014 We're all familiarwithtrafficlightsorstoplights.Often,greenarrowsare being used in thelightsforimprovedtrafficcontrol.Onsomemultilaneroads, greenarrowslightup,indicatingthattraffic in one or morelanescanmoveor makeaturn.Greenarrowsdon'tmean"gonomatterwhat."You'll still need of way to pedestriansand to proceedwithcaution,yieldingtheright sometimes to other vehicles. Sometrafficlightsalsouse turningonred. red arrows to signifythatyoumuststopbefore REVERSIBLE LANE ON MULTI-LANE ROADWAY I / r ' I \ I \ \ AM40201 5 Manycityroadsandexpressways,andevenbridges,usereversible-lane trafficcontrolduringrush hours. A red X lightabovealanemeansnodriving A greenarrowmeansyoumaydrive in thatlane. in thatlaneatthattime. Look forthesignsposted to warndriverswhathoursanddaysthese systems are ineffect. 4-8