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Approved 11/15/17 104 Andy Henry responded that the MPO does include a small portion of Chatham County in its planning area. He added 105 that MPO models the whole Triangle region in two ways: the travel demand model and the land use model, inclusive 106 of 10 counties. The model extends to Siler City in Chatham County. 107 108 David Laudicina commented that Chatham County is planning to develop its whole northeastern quadrant with 109 60,000 new residents. 110 111 Andy Henry agreed that Chatham County's population is growing the fastest, especially around Pittsboro with a new 112 development called Chatham Park, and the existing Briar Chapel community. Chatham County has an agreement 113 with Cary about how far they can come into the County with planning. There are a lot of apartments and senior 114 housing in that area. 115 116 Art Menius commented on the 2013 population just for the portion in Chatham; it is about twice the entire population 117 for Chatham in the 1980 census. 118 119 Andy Henry agreed that Chatham County is forecasted to grow pretty quickly. He continued his presentation. The 120 performance measures in the alternative analysis show different data on measures such as the average minutes of 121 delay per person and mode share in a "no build" scenario. Travel isochrones show how far someone can travel in the 122 afternoon peak within 10 -20 -30 minutes (see contours on the maps in presentation) in centers heavy in commuting 123 traffic around the Triangle (especially in downtown Durham, Chapel Hill, Hillsborough, etc.). The idea is to show how 124 easy it is to commute. Travel time is also measured on roadway corridors like 1 -85 to look at travel time in a "no build" 125 scenario and the effects of building alternatives. Mr. Henry pointed out that even with improvements, travel time will 126 not recover. According to the model, if travel time is 20 minutes with the "no build" scenario, it may go down to 16 127 minutes even with costly improvements, but not much lower than that. The congestion map shows volume (V = 128 number of vehicles on the road) divided by capacity (C = how many vehicles road can handle). Map is color -coded 129 per percentage. The level of service at a 1 (100 %) is a level of service "E," on an A -F range where "F" (120 %) is 130 traffic almost standing -still and "A" is free - flowing. Therefore, a level "E" is pretty congested. The main highway 131 corridors are very congested as well as areas within Chapel Hill and around it, especially around Estes Drive. 132 133 Heidi Perry asked if these maps are based off of single occupancy vehicles for each person, so when you think of 134 population growth, even with a "no build" scenario, you are talking about having more single occupancy vehicles. 135 136 Andy Henry said that he was glad Ms. Perry brought -up the "no build" scenario. The presentation is based on no 137 build, no further improvements with the 2045 population and employment on the model. However, it is not all single 138 occupancy vehicles; 10 —15% would not be single occupancy vehicles. 139 140 Heidi Perry asked if the current mode share is built -out too. 141 142 Andy Henry said that this is a difficult question to answer but the model does not take the current mode share. The 143 model has some behavior worked into it; it will change the mode share between single occupancy and multi - 144 occupancy. However, it does not change much; the model is not that sensitive. 145 146 Alex Castro asked who determines the perimeters of the model. 147 148 Andy Henry said that there is a team that works on the model. The Triangle Regional Model has 4 partners: our 149 MPO, the Capital Area MPO, NCDOT, and Go Triangle. The partners provide financial investment and there is a 150 model team at NC State in the Institute for Transportation Research and Education. 151 152 Alex Castro asked for clarification as to if there was a standard model used statewide. 153 154 Andy Henry replied that there is not a standard model. 155