交通信號燈是指揮交通(tong)運行(xing)(xing)的信號燈(deng)，一般由(you)紅燈(deng)、綠(lv)燈(deng)、黃(huang)(huang)燈(deng)組成。紅燈(deng)表(biao)示(shi)禁止(zhi)通(tong)行(xing)(xing)，綠(lv)燈(deng)表(biao)示(shi)準許通(tong)行(xing)(xing)，黃(huang)(huang)燈(deng)表(biao)示(shi)警示(shi)。

    交通信(xin)號(hao)(hao)(hao)燈(deng)(deng)分為(wei)：機動車信(xin)號(hao)(hao)(hao)燈(deng)(deng)、非機動車信(xin)號(hao)(hao)(hao)燈(deng)(deng)、人行橫(heng)道信(xin)號(hao)(hao)(hao)燈(deng)(deng)、方(fang)向指(zhi)示(shi)指(zhi)示(shi)燈(deng)(deng)（箭頭信(xin)號(hao)(hao)(hao)燈(deng)(deng)）、車道信(xin)號(hao)(hao)(hao)燈(deng)(deng)、閃(shan)光警告信(xin)號(hao)(hao)(hao)燈(deng)(deng)、道路與(yu)鐵路平面交叉道口信(xin)號(hao)(hao)(hao)燈(deng)(deng)。

    在(zai)十字(zi)路(lu)口，四面都懸掛著紅(hong)(hong)、黃(huang)、綠(lv)(lv)、三色交通(tong)(tong)信(xin)號燈(deng)，它是(shi)不出聲的“交通(tong)(tong)警(jing)察”。紅(hong)(hong)綠(lv)(lv)燈(deng)是(shi)國際統一的交通(tong)(tong)信(xin)號燈(deng)。紅(hong)(hong)燈(deng)是(shi)停(ting)(ting)(ting)止信(xin)號，綠(lv)(lv)燈(deng)是(shi)通(tong)(tong)行(xing)(xing)信(xin)號。交叉路(lu)口，幾個方向(xiang)來的車(che)(che)都匯集在(zai)這兒，有的要(yao)直(zhi)行(xing)(xing)，有的要(yao)拐彎，到底讓誰先走，這就是(shi)要(yao)聽從紅(hong)(hong)綠(lv)(lv)燈(deng)指(zhi)揮。紅(hong)(hong)燈(deng)亮(liang)，禁止直(zhi)行(xing)(xing)或(huo)(huo)左(zuo)轉彎，在(zai)不礙(ai)行(xing)(xing)人和車(che)(che)輛情況(kuang)下，允(yun)許車(che)(che)輛右轉彎；綠(lv)(lv)燈(deng)亮(liang)，準許車(che)(che)輛直(zhi)行(xing)(xing)或(huo)(huo)轉彎；黃(huang)燈(deng)亮(liang)，停(ting)(ting)(ting)在(zai)路(lu)口停(ting)(ting)(ting)止線或(huo)(huo)人行(xing)(xing)橫道(dao)線以內，已經繼續通(tong)(tong)行(xing)(xing)；黃(huang)燈(deng)閃(shan)爍時，警(jing)告車(che)(che)輛注(zhu)意安全(quan)。