交通信號燈是指(zhi)揮交(jiao)通運行的信號(hao)燈，一(yi)般(ban)由紅燈、綠(lv)燈、黃燈組(zu)成。紅燈表示禁止通行，綠(lv)燈表示準(zhun)許通行，黃燈表示警(jing)示。

    交(jiao)通信號(hao)(hao)燈(deng)(deng)(deng)(deng)分為(wei)：機動(dong)車(che)信號(hao)(hao)燈(deng)(deng)(deng)(deng)、非(fei)機動(dong)車(che)信號(hao)(hao)燈(deng)(deng)(deng)(deng)、人行橫道(dao)信號(hao)(hao)燈(deng)(deng)(deng)(deng)、方向指(zhi)示指(zhi)示燈(deng)(deng)(deng)(deng)（箭頭信號(hao)(hao)燈(deng)(deng)(deng)(deng)）、車(che)道(dao)信號(hao)(hao)燈(deng)(deng)(deng)(deng)、閃光警告信號(hao)(hao)燈(deng)(deng)(deng)(deng)、道(dao)路(lu)與(yu)鐵(tie)路(lu)平面交(jiao)叉(cha)道(dao)口信號(hao)(hao)燈(deng)(deng)(deng)(deng)。

    在(zai)十字路口，四面都懸掛著紅(hong)(hong)、黃(huang)、綠(lv)(lv)、三色(se)交(jiao)通(tong)(tong)信(xin)號(hao)(hao)燈(deng)，它是(shi)(shi)不(bu)出聲的(de)(de)“交(jiao)通(tong)(tong)警察”。紅(hong)(hong)綠(lv)(lv)燈(deng)是(shi)(shi)國際統(tong)一的(de)(de)交(jiao)通(tong)(tong)信(xin)號(hao)(hao)燈(deng)。紅(hong)(hong)燈(deng)是(shi)(shi)停止(zhi)(zhi)信(xin)號(hao)(hao)，綠(lv)(lv)燈(deng)是(shi)(shi)通(tong)(tong)行(xing)(xing)信(xin)號(hao)(hao)。交(jiao)叉路口，幾個(ge)方向(xiang)來的(de)(de)車都匯集在(zai)這(zhe)(zhe)兒，有的(de)(de)要(yao)直行(xing)(xing)，有的(de)(de)要(yao)拐彎，到底(di)讓誰(shui)先走，這(zhe)(zhe)就是(shi)(shi)要(yao)聽(ting)從紅(hong)(hong)綠(lv)(lv)燈(deng)指(zhi)揮。紅(hong)(hong)燈(deng)亮(liang)，禁止(zhi)(zhi)直行(xing)(xing)或左轉(zhuan)彎，在(zai)不(bu)礙(ai)行(xing)(xing)人(ren)和車輛情況下，允許(xu)車輛右(you)轉(zhuan)彎；綠(lv)(lv)燈(deng)亮(liang)，準許(xu)車輛直行(xing)(xing)或轉(zhuan)彎；黃(huang)燈(deng)亮(liang)，停在(zai)路口停止(zhi)(zhi)線或人(ren)行(xing)(xing)橫道線以(yi)內，已經繼續通(tong)(tong)行(xing)(xing)；黃(huang)燈(deng)閃(shan)爍(shuo)時，警告(gao)車輛注意安全。