In addition , considering traffic security , operational efficiency and people ' s travel habits , the setting of signal phases must satisfy strong constraints , such as maximum and minimum green time , maximum queue length and smooth switch of signal timing parameters 并且,從交通安全、通行效率及人們出行習(xí)慣的角度考慮,信號(hào)燈相位的設(shè)置具有很強(qiáng)的約束,如最短和最長(zhǎng)綠燈持續(xù)時(shí)間、最大排隊(duì)長(zhǎng)度以及信號(hào)燈的配時(shí)參數(shù)要具有一定的穩(wěn)定性不能變化太劇烈等等。