Mathematical models play a crucial role in informing policy decisions in areas such as urban planning and transportation by providing insights into complex systems and predicting potential outcomes. These models use data and algorithms to simulate different scenarios, allowing policymakers to evaluate the impact of various policies before implementation. For example, in urban planning, mathematical models can help assess the effects of zoning regulations, infrastructure projects, or population growth on a city's development. In transportation, these models can optimize routes, analyze traffic flow, and predict future demand to improve public transit systems and reduce congestion. By using mathematical modeling, policymakers can make more informed decisions that are supported by quantitative evidence and analysis.