交通信號燈是指揮交通(tong)(tong)(tong)運(yun)行的信號燈(deng)(deng)，一般由紅燈(deng)(deng)、綠燈(deng)(deng)、黃(huang)燈(deng)(deng)組成。紅燈(deng)(deng)表示(shi)禁止通(tong)(tong)(tong)行，綠燈(deng)(deng)表示(shi)準許通(tong)(tong)(tong)行，黃(huang)燈(deng)(deng)表示(shi)警示(shi)。

    交通信(xin)號(hao)(hao)燈(deng)分為：機動(dong)車信(xin)號(hao)(hao)燈(deng)、非機動(dong)車信(xin)號(hao)(hao)燈(deng)、人行(xing)橫道(dao)信(xin)號(hao)(hao)燈(deng)、方向(xiang)指(zhi)示指(zhi)示燈(deng)（箭頭信(xin)號(hao)(hao)燈(deng)）、車道(dao)信(xin)號(hao)(hao)燈(deng)、閃光警告(gao)信(xin)號(hao)(hao)燈(deng)、道(dao)路與鐵(tie)路平面交叉道(dao)口(kou)信(xin)號(hao)(hao)燈(deng)。

    在(zai)(zai)十字路口，四面都(dou)懸掛著紅(hong)、黃(huang)、綠(lv)、三(san)色(se)交(jiao)通(tong)信號燈(deng)(deng)(deng)，它是(shi)(shi)不出(chu)聲的“交(jiao)通(tong)警察”。紅(hong)綠(lv)燈(deng)(deng)(deng)是(shi)(shi)國(guo)際統一的交(jiao)通(tong)信號燈(deng)(deng)(deng)。紅(hong)燈(deng)(deng)(deng)是(shi)(shi)停止信號，綠(lv)燈(deng)(deng)(deng)是(shi)(shi)通(tong)行(xing)(xing)信號。交(jiao)叉(cha)路口，幾個方(fang)向來(lai)的車都(dou)匯(hui)集在(zai)(zai)這兒，有的要(yao)直(zhi)行(xing)(xing)，有的要(yao)拐(guai)彎(wan)(wan)，到底(di)讓誰先走，這就是(shi)(shi)要(yao)聽從紅(hong)綠(lv)燈(deng)(deng)(deng)指(zhi)揮。紅(hong)燈(deng)(deng)(deng)亮，禁止直(zhi)行(xing)(xing)或(huo)左轉(zhuan)彎(wan)(wan)，在(zai)(zai)不礙行(xing)(xing)人(ren)和車輛(liang)情況下，允許車輛(liang)右(you)轉(zhuan)彎(wan)(wan)；綠(lv)燈(deng)(deng)(deng)亮，準許車輛(liang)直(zhi)行(xing)(xing)或(huo)轉(zhuan)彎(wan)(wan)；黃(huang)燈(deng)(deng)(deng)亮，停在(zai)(zai)路口停止線(xian)或(huo)人(ren)行(xing)(xing)橫道線(xian)以內，已經繼續通(tong)行(xing)(xing)；黃(huang)燈(deng)(deng)(deng)閃爍時，警告(gao)車輛(liang)注意安全(quan)。