交通信號燈是(shi)指揮交通(tong)運行(xing)的(de)信號(hao)燈，一般由紅(hong)燈、綠燈、黃(huang)(huang)燈組(zu)成。紅(hong)燈表(biao)(biao)示禁止(zhi)通(tong)行(xing)，綠燈表(biao)(biao)示準(zhun)許通(tong)行(xing)，黃(huang)(huang)燈表(biao)(biao)示警示。

    交(jiao)通信(xin)(xin)號(hao)(hao)(hao)燈(deng)(deng)分為(wei)：機動(dong)車(che)(che)信(xin)(xin)號(hao)(hao)(hao)燈(deng)(deng)、非機動(dong)車(che)(che)信(xin)(xin)號(hao)(hao)(hao)燈(deng)(deng)、人(ren)行橫道信(xin)(xin)號(hao)(hao)(hao)燈(deng)(deng)、方向指(zhi)示指(zhi)示燈(deng)(deng)（箭頭信(xin)(xin)號(hao)(hao)(hao)燈(deng)(deng)）、車(che)(che)道信(xin)(xin)號(hao)(hao)(hao)燈(deng)(deng)、閃光警(jing)告信(xin)(xin)號(hao)(hao)(hao)燈(deng)(deng)、道路與鐵路平面交(jiao)叉道口信(xin)(xin)號(hao)(hao)(hao)燈(deng)(deng)。

    在(zai)十字路口(kou)(kou)(kou)，四(si)面(mian)都(dou)懸掛著紅(hong)、黃、綠、三色(se)交(jiao)通(tong)(tong)(tong)信(xin)號(hao)燈(deng)(deng)，它是不出(chu)聲的“交(jiao)通(tong)(tong)(tong)警察(cha)”。紅(hong)綠燈(deng)(deng)是國際統一的交(jiao)通(tong)(tong)(tong)信(xin)號(hao)燈(deng)(deng)。紅(hong)燈(deng)(deng)是停(ting)(ting)止(zhi)(zhi)信(xin)號(hao)，綠燈(deng)(deng)是通(tong)(tong)(tong)行(xing)(xing)(xing)信(xin)號(hao)。交(jiao)叉路口(kou)(kou)(kou)，幾(ji)個方向來的車都(dou)匯集(ji)在(zai)這(zhe)兒(er)，有(you)的要直(zhi)行(xing)(xing)(xing)，有(you)的要拐彎，到(dao)底讓誰先(xian)走(zou)，這(zhe)就是要聽(ting)從(cong)紅(hong)綠燈(deng)(deng)指揮。紅(hong)燈(deng)(deng)亮(liang)，禁止(zhi)(zhi)直(zhi)行(xing)(xing)(xing)或(huo)左轉(zhuan)(zhuan)彎，在(zai)不礙(ai)行(xing)(xing)(xing)人和(he)車輛(liang)(liang)情況下，允(yun)許(xu)車輛(liang)(liang)右轉(zhuan)(zhuan)彎；綠燈(deng)(deng)亮(liang)，準許(xu)車輛(liang)(liang)直(zhi)行(xing)(xing)(xing)或(huo)轉(zhuan)(zhuan)彎；黃燈(deng)(deng)亮(liang)，停(ting)(ting)在(zai)路口(kou)(kou)(kou)停(ting)(ting)止(zhi)(zhi)線(xian)或(huo)人行(xing)(xing)(xing)橫道線(xian)以內，已(yi)經繼續通(tong)(tong)(tong)行(xing)(xing)(xing)；黃燈(deng)(deng)閃爍時，警告車輛(liang)(liang)注意(yi)安全。