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DRAFT November 21, 1995 The result of trip generation analysis was a listing of existing and ultimate • trips generated by type (residential, commercial/industrial) for the 14 TAZs, and existing and ultimate trips generated by the 13 external zones. From this point on in the process, trips generated by recreational facilities were included in commercial/industrial totals. 2. Trip Distribution After trips are generated for each TAZ and external zone they must be distributed. Trips are divided into three categories: external-external (E- E), external-internal (E-I), and internal-internal (I-I). External-external trips are those trips where a vehicle passes through the City from one external zone to another without making a single stop. In order to determine how many trips fall into each category an origin-destination (O- D) survey must be done. 0-D surveys can be done in a variety of ways, including roadside interviews, handing out post cards to drivers, moving vehicle license plate surveys, dwelling unit interviews, vehicle owner mail questionnaires, and others. In Elk River we decided to conduct a moving vehicle license plate survey on Trunk Highways 10, 169, and 101. This was the most reasonable method from a cost perspective when one considered the time in the field collecting data and the office data reduction time. It was also the safest and least disruptive to traffic, since vehicles . were not required to slow down or stop at a survey station. This was a particularly important consideration when conducting a survey on busy multi-lane highways. Four survey stations were set up: on T.H. 10 west of Waco Street, on T.H. 10 east of Cleveland and Jarvis Streets, on T.H. 169 north of 225th Avenue and on T.H. 101 south of the Mississippi River bridge. Two people were placed at each station, one to record license plates of inbound vehicles and one to record outbound license plates. The time that each vehicle passed the station was also recorded. Inbound vehicles were traced through the system. If the same license plate showed up at an outbound station, the inbound and outbound times were checked to determine whether or not it appeared that the vehicle had made a stop in Elk River. In bound vehicles whose license plates were not traced to an outbound station either exited the City via another route or were destined for a location in Elk River. Ideally, people would have been stationed on every road crossing the Elk River City limits. However, the cost of collecting and reducing data would have been prohibitive. Therefore, assumptions were made about the percentage of E-E trips entering or departing the City on these other roads. From the data collected and the assumptions made, the number of vehicles • passing by at each external zone was divided into E-E and E-I trips. E-E trips between the external zones that served as survey stations were allocated based on the actual survey data. Remaining E-E trips and E-I CTP-230.156 -6- 230-156-80