交通信號燈是指揮交(jiao)通運行的(de)信(xin)號燈，一般由紅(hong)燈、綠(lv)燈、黃燈組成。紅(hong)燈表示(shi)(shi)禁止通行，綠(lv)燈表示(shi)(shi)準許(xu)通行，黃燈表示(shi)(shi)警(jing)示(shi)(shi)。

    交通信(xin)號(hao)(hao)燈分為：機(ji)動車(che)信(xin)號(hao)(hao)燈、非機(ji)動車(che)信(xin)號(hao)(hao)燈、人行橫道(dao)信(xin)號(hao)(hao)燈、方向指示指示燈（箭頭信(xin)號(hao)(hao)燈）、車(che)道(dao)信(xin)號(hao)(hao)燈、閃(shan)光警告信(xin)號(hao)(hao)燈、道(dao)路與鐵路平(ping)面交叉道(dao)口信(xin)號(hao)(hao)燈。

    在十字路(lu)口，四(si)面都懸(xuan)掛著紅(hong)(hong)、黃(huang)(huang)、綠、三色交通(tong)信號(hao)燈(deng)(deng)(deng)，它是(shi)(shi)(shi)不出聲的“交通(tong)警(jing)察”。紅(hong)(hong)綠燈(deng)(deng)(deng)是(shi)(shi)(shi)國際統一的交通(tong)信號(hao)燈(deng)(deng)(deng)。紅(hong)(hong)燈(deng)(deng)(deng)是(shi)(shi)(shi)停(ting)止(zhi)信號(hao)，綠燈(deng)(deng)(deng)是(shi)(shi)(shi)通(tong)行(xing)(xing)信號(hao)。交叉路(lu)口，幾個方向來的車(che)都匯集在這兒，有(you)的要(yao)直行(xing)(xing)，有(you)的要(yao)拐(guai)彎，到(dao)底(di)讓誰先走，這就是(shi)(shi)(shi)要(yao)聽從紅(hong)(hong)綠燈(deng)(deng)(deng)指揮。紅(hong)(hong)燈(deng)(deng)(deng)亮，禁止(zhi)直行(xing)(xing)或左轉(zhuan)彎，在不礙行(xing)(xing)人和車(che)輛(liang)情況下，允許車(che)輛(liang)右轉(zhuan)彎；綠燈(deng)(deng)(deng)亮，準(zhun)許車(che)輛(liang)直行(xing)(xing)或轉(zhuan)彎；黃(huang)(huang)燈(deng)(deng)(deng)亮，停(ting)在路(lu)口停(ting)止(zhi)線(xian)(xian)或人行(xing)(xing)橫道線(xian)(xian)以內，已經繼續通(tong)行(xing)(xing)；黃(huang)(huang)燈(deng)(deng)(deng)閃(shan)爍時，警(jing)告(gao)車(che)輛(liang)注意安全。