Why isn’t there an access point in Richardson?
The short answer: Traffic projections, if correct, show that if there was an access point in the Arapaho Road-Campbell Road area then the HOV lane would become ineffective. The long answer: “The point of the HOV lane is to move traffic,” Petras states, “Engineers tell us that at about 1600 to 1800 vehicles per hour an HOV lane becomes ineffective.” According to Petras, the traffic projections state that in Allen an average of 1026 cars would enter the HOV lane per hour. In Plano, as the HOV lane is now configured with an access point, 554 vehicles would enter and 256 would exit. This leaves just over 1300 vehicles in the HOV lane. The projections for a hypothetical Arapaho-Campbell access point in Richardson would add 766 cars and 254 would exit. This puts the total over 1800 vehicles, which is above the high-end limit of the HOV lane.
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