The best-estimate benefit-to-cost ratios (BCRs) presented in Chapter V, represent the most likely outcome if road safety and motorization trends continue as they have done in recent years, taking into account mid-range estimates of the effectiveness of vehicle safety technologies, road traffic crash populations, technology costs and estimates for the VSL that are assessed in the model. However, as there is inherent uncertainty in all predictions made, exploring the impact of changing model input parameters on calculated BCRs, through performing a sensitivity analysis, is required to improve the robustness of the results over the timeline under observation.

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