交通信號燈是(shi)指揮交通(tong)運行的信號燈，一般由紅燈、綠燈、黃(huang)燈組成。紅燈表示(shi)禁止通(tong)行，綠燈表示(shi)準許通(tong)行，黃(huang)燈表示(shi)警示(shi)。

    交通信(xin)號(hao)(hao)燈(deng)分為(wei)：機動車(che)信(xin)號(hao)(hao)燈(deng)、非機動車(che)信(xin)號(hao)(hao)燈(deng)、人行橫道(dao)信(xin)號(hao)(hao)燈(deng)、方向指(zhi)示指(zhi)示燈(deng)（箭頭(tou)信(xin)號(hao)(hao)燈(deng)）、車(che)道(dao)信(xin)號(hao)(hao)燈(deng)、閃光警(jing)告信(xin)號(hao)(hao)燈(deng)、道(dao)路與鐵路平面交叉道(dao)口信(xin)號(hao)(hao)燈(deng)。

    在(zai)十字路口，四面都(dou)懸(xuan)掛著(zhu)紅、黃、綠(lv)、三色(se)交通(tong)(tong)(tong)(tong)信(xin)(xin)號燈(deng)(deng)(deng)，它是(shi)不出聲(sheng)的“交通(tong)(tong)(tong)(tong)警察”。紅綠(lv)燈(deng)(deng)(deng)是(shi)國際統一(yi)的交通(tong)(tong)(tong)(tong)信(xin)(xin)號燈(deng)(deng)(deng)。紅燈(deng)(deng)(deng)是(shi)停(ting)止(zhi)(zhi)信(xin)(xin)號，綠(lv)燈(deng)(deng)(deng)是(shi)通(tong)(tong)(tong)(tong)行(xing)信(xin)(xin)號。交叉路口，幾個(ge)方向來的車(che)都(dou)匯集在(zai)這兒(er)，有的要(yao)直行(xing)，有的要(yao)拐(guai)彎(wan)，到(dao)底(di)讓誰先走，這就(jiu)是(shi)要(yao)聽從(cong)紅綠(lv)燈(deng)(deng)(deng)指(zhi)揮(hui)。紅燈(deng)(deng)(deng)亮，禁止(zhi)(zhi)直行(xing)或左轉彎(wan)，在(zai)不礙(ai)行(xing)人和車(che)輛情(qing)況下，允許車(che)輛右轉彎(wan)；綠(lv)燈(deng)(deng)(deng)亮，準許車(che)輛直行(xing)或轉彎(wan)；黃燈(deng)(deng)(deng)亮，停(ting)在(zai)路口停(ting)止(zhi)(zhi)線或人行(xing)橫道線以內(nei)，已經繼續通(tong)(tong)(tong)(tong)行(xing)；黃燈(deng)(deng)(deng)閃(shan)爍時(shi)，警告車(che)輛注意(yi)安全。