Uyini umehluko e-US phakathi kwesibonakaliso sokuma nesibonakaliso somgwaqo?
Uphawu lwe-Stop luwuphawu lwensimbi olunezinhlangothi eziyisishiyagalombili olubomvu oludinga umshayeli ukuba ame bese eqhubeka lapho kuphephile ukwenza kanjalo. Izimpambana-mgwaqo eziningi zinezimpawu ezimbili noma ezine zokuma. Lapho izimoto ezingaphezu kweyodwa zifika empambanweni, imoto efike kuqala inelungelo lokudlula. Uma kufika izimoto ezingaphezu kweyodwa ngesikhathi esifanayo, khona-ke imoto engakwesokudla inelungelo lokudlula. Ngokuvamile isibani somgwaqo esisebenza ngogesi sinezimpawu ezintathu ezihlukene: obomvu ubonisa ukuthi abashayeli kufanele bayeke kuze kushintshe isibani; isibani esiphuzi sibonisa ukuthi umshayeli kufanele ayeke uma kuphephile ukwenza kanjalo ngoba isignali ishintsha kusuka kokubomvu kuya kokuluhlaza; futhi isibani esiluhlaza sisho ukuthi abashayeli bangaqhubeka nomgwaqo ngaphandle kokuma.