Net Present Value (NPV) is used to evaluate what?

• A. Future value of benefits only
• B. Crash frequency
• C. Net present value of project costs
• D. Present value of net benefits over time

Answer: (D)

Net Present Value evaluates whether a project creates value by accounting for the time value of money. It brings all expected benefits and costs that occur over the project’s life back to their value today and then subtracts the costs from the benefits. The result is the present value of net benefits over time. A positive NPV means benefits exceed costs when discounted to present terms, while a negative NPV means the opposite. This is especially useful in road safety analysis, where benefits like crash reductions may occur far in the future and must be weighed against upfront and ongoing costs. The other options don’t capture this balance: focusing only on the future value of benefits ignores costs and the discounting, crash frequency is a separate measure, and only considering the present value of costs misses the net comparison.