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Model Results Will Differ Based on User Inputs

• The model uses the following user-specified inputs: the growth in vehicle miles traveled in a baseline future without HAVs, the change in safety rate of non-HAVs, the timing and extent of HAV diffusion, the impact of HAVs on transportation demand, the safety performance of HAVs initially and over time, and the upgradeability of HAVs.
• Illustrations of model use show that the future may unfold in complex and important ways that are not obvious when attention is paid only to safety at the time of HAV introduction. Such information might raise different policy questions, such as how policies can be crafted to encourage rapid learning or how trade-offs should be made between smaller short-term risks that may lead to larger longer-term gains.