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The article presents the results of a study, conducted by the Department of Transportation (DOT) in Texas, on the effects of access density on operating speed. The study revealed that speed is slower for high-access density and a high variability exists between speed and access density. It concluded that for access densities above approximately 20 access points (acs)/kilometer (km) on one-way and 16 acs/km on two-way facilities, increases in travel time of about 10 percent to 15 percent exist.