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MOVING TOWARD ITP GOALS REQUIRES MANAGING DEMAND & CAPACITY
The four tested alternatives marry a range of capacity (providing more road space) and demand (shifting demand to modes other than driving alone) strategies. Modeling makes a few things clear:
• Simply adding a second travel lane per direction induced demand such that vehicle volumes increased by over 41%.
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• TDM programing is critical, but when a travel lane is added, vehicle trips still increase by 28%
• A combination of restrictive capacity additions (shoulder transit or HOV 2+ and Transit) with TDM are expected to modestly reduce vehicle demand compared to today. Shoulder running transit + TDM results in a 3% reduction in vehicle volume.