好心人帮忙翻译下 谢了!

好心人帮忙翻译下 谢了!
Fixed control strategies are based on a signal-timing plan defined in terms of operating parameters for traditional signal control,namely cycle time,splits,and offsets.These parameters are generally developed based on traffic studies and standard procedures,such as the Highway CapacitiManual,or signal timing software such as TRANSYT and PASSER.The traffic studies result in estimates of trafficconditions,link volumes and turning percentages,for specified time periods.Signal timing parameters are developed for each of these time periods and,typically,implemented on a time-of-day basis with no consideration of current actual traffic conditions.In many cases,even the use of standard procedures for the development of signal timing plans is abandoned and traffic engineers operate in judgment-based fashion with moderate levels of success.None of these approaches is truly traffic-adaptive or even attempt to actually minimize some measure of traffic performance such as average vehicle-delay.