交通信號燈是(shi)指揮(hui)交(jiao)通(tong)運行的信(xin)號燈(deng)，一般由紅(hong)燈(deng)、綠(lv)燈(deng)、黃燈(deng)組成。紅(hong)燈(deng)表示禁止通(tong)行，綠(lv)燈(deng)表示準(zhun)許通(tong)行，黃燈(deng)表示警(jing)示。

    交通信(xin)(xin)號(hao)燈(deng)分為：機動車信(xin)(xin)號(hao)燈(deng)、非機動車信(xin)(xin)號(hao)燈(deng)、人(ren)行橫(heng)道(dao)(dao)信(xin)(xin)號(hao)燈(deng)、方向指(zhi)(zhi)示指(zhi)(zhi)示燈(deng)（箭頭信(xin)(xin)號(hao)燈(deng)）、車道(dao)(dao)信(xin)(xin)號(hao)燈(deng)、閃光警告(gao)信(xin)(xin)號(hao)燈(deng)、道(dao)(dao)路與鐵路平面交叉道(dao)(dao)口信(xin)(xin)號(hao)燈(deng)。

    在(zai)十字路口，四面都懸掛著紅(hong)(hong)、黃、綠(lv)、三色交(jiao)通(tong)(tong)(tong)(tong)(tong)信號燈(deng)(deng)，它是(shi)不出聲的(de)“交(jiao)通(tong)(tong)(tong)(tong)(tong)警(jing)察”。紅(hong)(hong)綠(lv)燈(deng)(deng)是(shi)國際統一的(de)交(jiao)通(tong)(tong)(tong)(tong)(tong)信號燈(deng)(deng)。紅(hong)(hong)燈(deng)(deng)是(shi)停(ting)止信號，綠(lv)燈(deng)(deng)是(shi)通(tong)(tong)(tong)(tong)(tong)行(xing)信號。交(jiao)叉路口，幾個方向來的(de)車(che)都匯(hui)集在(zai)這兒(er)，有(you)的(de)要(yao)直行(xing)，有(you)的(de)要(yao)拐彎，到底讓誰先走，這就是(shi)要(yao)聽從紅(hong)(hong)綠(lv)燈(deng)(deng)指揮。紅(hong)(hong)燈(deng)(deng)亮，禁止直行(xing)或左轉(zhuan)彎，在(zai)不礙(ai)行(xing)人和車(che)輛情況下，允許車(che)輛右轉(zhuan)彎；綠(lv)燈(deng)(deng)亮，準許車(che)輛直行(xing)或轉(zhuan)彎；黃燈(deng)(deng)亮，停(ting)在(zai)路口停(ting)止線(xian)(xian)或人行(xing)橫道線(xian)(xian)以(yi)內，已經繼續通(tong)(tong)(tong)(tong)(tong)行(xing)；黃燈(deng)(deng)閃爍時，警(jing)告(gao)車(che)輛注意安全。