area from each centroid. The network used for this service area was taken from Open Street Map, which provides detailed routing information for multiple modes of transportation. Non- nodal zones were derived from residential areas and community planning areas within the non- nodal portion of the study area. These zones were split along major roadways or roadways that naturally divide parts of the study area. 3.2.3 Zones (OD Analysis) Figure 30 presents the location of the zones developed for the OD analysis. Three primary roads provide access to the study area and access from the study area to other places: US41, US301, and I-75. To capture the trips that leave or enter the zone through these major roads, Streetlight Data requires specifying a special type of zone. Streetlight Data only provide trips between zones in the study area, except in the case of a pass-through gate. Pass-through gates count the number of trips that pass through a small stretch of road in both directions of traffic. Six gates (three in the north and three in the south) were designated and used to understand trips that entered or left the zones within the study area to/from outside of the study area. A separate designation, Alternate Gate, was used to account for trips originating from the zone and leaving the study area, but not through one of the gates, and also for trips entering the study area but not through the gates.
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