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Mr. Sullivan asked if staff needed this direction to run the models and asked how "flexibility" would be taken into account. Mr. Knowles said the key for the model is the Vineyard Corridor. There is a constraint on traffic from Livermore every morning. Everything along that corridor would change if the direction were to remove the constraint. Mr. Sullivan referred to the figures for 2025 regional build out along with Pleasanton's existing plus approved units with mitigations and asked if some of those mitigations included constrained gateways? Mr. Knowles said that some were. However, in reviewing the four intersections on Sunol, the gateway constraints were removed. There is flexibility and each intersection will be addressed. Mr. Sullivan supported the concept of constrained gateways. He felt if Stoneridge and West Las Positas were constructed, it would open a floodgate of traffic. If the constraints were removed, it is also a floodgate to allow traffic into the city. He wanted to look at constrained gateways with the theory that the middle of the city would be opened. Ms. Maas was concerned about the impact on businesses and the possibility that people would say it is so hard to get into the city that they would go elsewhere. This is a very difficult balance. Mayor Hosterman preferred the constrained gateway approach. There have been places where it has worked well and others where it has not. They allow traffic to flow in some sort of measured way. She supported having staff continue to use constrained gateways. Ms. McGovern said everyone talks about this great tool of traffic modeling, but no one considers how many multiple assumptions go into this tool. Each one of the assumptions can have plus or minus impacts on traffic models. When she reviewed the tables, it appeared about 77% of the people coming to work in Pleasanton are non- residents. Mr. Knowles said according to surveys, about 60% were non-residents. Ms. McGovern noted the Housing Element said 79% of jobs were held by people who commuted into the city. One of the things that have not been addressed is commercial development and additional job possibilities in the future. She asked how that assumption would be included in the tool? Mr. Knowles said that would occur when there is discussion of the land use. If there is a different number to be used for office or retail, that will go into the model. Ms. McGovern wanted to see the assumptions with every model so she could understand where the differences could be. She was at a meeting with MTC and LAVTA where transit oriented development was discussed. The number of people who Joint Workshop City Council and Planning Commission 13 05/24/05