交通信號燈是(shi)指(zhi)揮交通(tong)運行(xing)的信號燈，一般由紅(hong)燈、綠燈、黃燈組成。紅(hong)燈表(biao)示禁止通(tong)行(xing)，綠燈表(biao)示準許通(tong)行(xing)，黃燈表(biao)示警(jing)示。

    交通信(xin)號(hao)(hao)(hao)(hao)燈(deng)(deng)分(fen)為：機(ji)動車信(xin)號(hao)(hao)(hao)(hao)燈(deng)(deng)、非機(ji)動車信(xin)號(hao)(hao)(hao)(hao)燈(deng)(deng)、人行橫(heng)道信(xin)號(hao)(hao)(hao)(hao)燈(deng)(deng)、方向指示指示燈(deng)(deng)（箭頭信(xin)號(hao)(hao)(hao)(hao)燈(deng)(deng)）、車道信(xin)號(hao)(hao)(hao)(hao)燈(deng)(deng)、閃光警(jing)告信(xin)號(hao)(hao)(hao)(hao)燈(deng)(deng)、道路與(yu)鐵路平面交叉道口信(xin)號(hao)(hao)(hao)(hao)燈(deng)(deng)。

    在(zai)(zai)十字路口，四面都(dou)懸掛著紅(hong)、黃(huang)、綠、三色交通(tong)(tong)(tong)信(xin)號(hao)(hao)燈(deng)(deng)(deng)，它(ta)是(shi)不出聲的(de)“交通(tong)(tong)(tong)警察”。紅(hong)綠燈(deng)(deng)(deng)是(shi)國際統一的(de)交通(tong)(tong)(tong)信(xin)號(hao)(hao)燈(deng)(deng)(deng)。紅(hong)燈(deng)(deng)(deng)是(shi)停(ting)止信(xin)號(hao)(hao)，綠燈(deng)(deng)(deng)是(shi)通(tong)(tong)(tong)行(xing)(xing)信(xin)號(hao)(hao)。交叉路口，幾個(ge)方(fang)向來的(de)車(che)(che)都(dou)匯集(ji)在(zai)(zai)這(zhe)兒，有(you)的(de)要直行(xing)(xing)，有(you)的(de)要拐彎(wan)(wan)，到(dao)底讓(rang)誰先走，這(zhe)就(jiu)是(shi)要聽從紅(hong)綠燈(deng)(deng)(deng)指揮。紅(hong)燈(deng)(deng)(deng)亮，禁止直行(xing)(xing)或(huo)(huo)左轉(zhuan)彎(wan)(wan)，在(zai)(zai)不礙(ai)行(xing)(xing)人(ren)和(he)車(che)(che)輛(liang)情(qing)況下，允許車(che)(che)輛(liang)右轉(zhuan)彎(wan)(wan)；綠燈(deng)(deng)(deng)亮，準許車(che)(che)輛(liang)直行(xing)(xing)或(huo)(huo)轉(zhuan)彎(wan)(wan)；黃(huang)燈(deng)(deng)(deng)亮，停(ting)在(zai)(zai)路口停(ting)止線(xian)或(huo)(huo)人(ren)行(xing)(xing)橫道線(xian)以內(nei)，已經繼(ji)續通(tong)(tong)(tong)行(xing)(xing)；黃(huang)燈(deng)(deng)(deng)閃爍時，警告車(che)(che)輛(liang)注意安(an)全。