(b) Approach II: COMSIS Corporation Method COMSIS et al. (1995) provided a procedure for speed estimation under the effect of congestion. Applying traffic simulation model runs with FHWA’s FRESIM and NETSIM computer programs, a macroscopic simulation model, QSIM, was developed to examine the effects of queuing on speeds. QSIM produced hourly speed out-puts for segments with AWDT/capacity ranging from 1 to 16. Average weekday daily traffic (AADT) to take into account the effect of varying traffic on weekdays and weekends. Speed look-up tables were developed for the estimation of speed at the end of each hour as function of AWDT/capacity ratio, depending on the functional class of the road. Table 5.1 shows the speed look-up table for estimation hourly speed at freeways.