交通信號燈是(shi)指揮(hui)交通(tong)運行的信號(hao)燈(deng)，一般由紅(hong)燈(deng)、綠燈(deng)、黃燈(deng)組成。紅(hong)燈(deng)表(biao)示(shi)禁止通(tong)行，綠燈(deng)表(biao)示(shi)準許通(tong)行，黃燈(deng)表(biao)示(shi)警示(shi)。

    交(jiao)通信(xin)(xin)(xin)(xin)號燈(deng)(deng)分為：機動車信(xin)(xin)(xin)(xin)號燈(deng)(deng)、非機動車信(xin)(xin)(xin)(xin)號燈(deng)(deng)、人行橫(heng)道(dao)(dao)信(xin)(xin)(xin)(xin)號燈(deng)(deng)、方向指(zhi)示指(zhi)示燈(deng)(deng)（箭頭信(xin)(xin)(xin)(xin)號燈(deng)(deng)）、車道(dao)(dao)信(xin)(xin)(xin)(xin)號燈(deng)(deng)、閃光警告信(xin)(xin)(xin)(xin)號燈(deng)(deng)、道(dao)(dao)路(lu)與鐵路(lu)平面(mian)交(jiao)叉道(dao)(dao)口信(xin)(xin)(xin)(xin)號燈(deng)(deng)。

    在十(shi)字路口(kou)，四面都懸掛著(zhu)紅(hong)(hong)(hong)、黃、綠、三色交(jiao)通(tong)(tong)信號燈(deng)，它是(shi)不(bu)出(chu)聲(sheng)的(de)“交(jiao)通(tong)(tong)警(jing)察”。紅(hong)(hong)(hong)綠燈(deng)是(shi)國際統一(yi)的(de)交(jiao)通(tong)(tong)信號燈(deng)。紅(hong)(hong)(hong)燈(deng)是(shi)停(ting)止信號，綠燈(deng)是(shi)通(tong)(tong)行(xing)(xing)信號。交(jiao)叉路口(kou)，幾(ji)個方向來的(de)車(che)(che)都匯集(ji)在這(zhe)兒，有的(de)要(yao)直行(xing)(xing)，有的(de)要(yao)拐彎(wan)，到底讓(rang)誰先走(zou)，這(zhe)就是(shi)要(yao)聽從紅(hong)(hong)(hong)綠燈(deng)指揮。紅(hong)(hong)(hong)燈(deng)亮，禁(jin)止直行(xing)(xing)或左轉(zhuan)彎(wan)，在不(bu)礙行(xing)(xing)人和車(che)(che)輛(liang)(liang)情況下，允許車(che)(che)輛(liang)(liang)右轉(zhuan)彎(wan)；綠燈(deng)亮，準許車(che)(che)輛(liang)(liang)直行(xing)(xing)或轉(zhuan)彎(wan)；黃燈(deng)亮，停(ting)在路口(kou)停(ting)止線(xian)或人行(xing)(xing)橫道線(xian)以內，已經繼續通(tong)(tong)行(xing)(xing)；黃燈(deng)閃爍時，警(jing)告(gao)車(che)(che)輛(liang)(liang)注意安(an)全(quan)。