Similarly, it is considered that for the trip distribution process, the trip production and attraction rates are not measured
using road counts, but are estimated from land use based on trip distribution equations. Such forecasts are typically
estimated as daily averages, and sometimes as peak period averages. However, at present, trip end estimates are not
commonly available by 15-minute interval, making the estimation of 15-minute O-D matrices using trip distribution
methods is virtually impossible. Of course, planning scale 24-hour or peak period matrices can be scaled to produce 15-
minute matrices using traffic flow counts. However, a better approach would be to treat the trip distribution matrix as a
seed matrix, and then systematically utilize the observed traffic flow counts in a synthetic O-D generation process.