交通信號燈是指(zhi)揮(hui)交通運行的(de)信號(hao)燈，一般(ban)由紅(hong)燈、綠燈、黃(huang)燈組成(cheng)。紅(hong)燈表(biao)(biao)示禁止(zhi)通行，綠燈表(biao)(biao)示準許(xu)通行，黃(huang)燈表(biao)(biao)示警示。

    交通信(xin)(xin)號(hao)(hao)(hao)燈分為：機動車信(xin)(xin)號(hao)(hao)(hao)燈、非(fei)機動車信(xin)(xin)號(hao)(hao)(hao)燈、人行橫(heng)道(dao)信(xin)(xin)號(hao)(hao)(hao)燈、方向指示指示燈（箭頭信(xin)(xin)號(hao)(hao)(hao)燈）、車道(dao)信(xin)(xin)號(hao)(hao)(hao)燈、閃光警(jing)告(gao)信(xin)(xin)號(hao)(hao)(hao)燈、道(dao)路與鐵路平面交叉道(dao)口信(xin)(xin)號(hao)(hao)(hao)燈。

    在十(shi)字路(lu)口(kou)，四面都懸掛著紅(hong)、黃(huang)、綠(lv)、三色交通(tong)(tong)(tong)信號(hao)燈(deng)，它是(shi)不出聲的“交通(tong)(tong)(tong)警(jing)察”。紅(hong)綠(lv)燈(deng)是(shi)國際(ji)統一的交通(tong)(tong)(tong)信號(hao)燈(deng)。紅(hong)燈(deng)是(shi)停(ting)止(zhi)信號(hao)，綠(lv)燈(deng)是(shi)通(tong)(tong)(tong)行(xing)信號(hao)。交叉路(lu)口(kou)，幾個(ge)方向來(lai)的車都匯集在這兒，有的要(yao)直(zhi)行(xing)，有的要(yao)拐彎，到底讓誰先走，這就是(shi)要(yao)聽從紅(hong)綠(lv)燈(deng)指(zhi)揮(hui)。紅(hong)燈(deng)亮，禁(jin)止(zhi)直(zhi)行(xing)或左轉(zhuan)彎，在不礙行(xing)人和車輛情況下(xia)，允許(xu)車輛右轉(zhuan)彎；綠(lv)燈(deng)亮，準許(xu)車輛直(zhi)行(xing)或轉(zhuan)彎；黃(huang)燈(deng)亮，停(ting)在路(lu)口(kou)停(ting)止(zhi)線(xian)或人行(xing)橫(heng)道(dao)線(xian)以(yi)內，已(yi)經(jing)繼續通(tong)(tong)(tong)行(xing)；黃(huang)燈(deng)閃爍時，警(jing)告車輛注意安(an)全(quan)。