How does transportation engineering influence urban planning and development? Explore the interdisciplinary relationship between transportation infrastructure and urban design, considering factors such as land use patterns, accessibility, and sustainability. Discuss the role of transportation planning in shaping the spatial layout of cities, including the design of road networks, public transit systems, and pedestrian$-$friendly environments. Delve into the principles of traffic engineering, including traffic flow theory, capacity analysis, and traffic signal optimization, and their application in managing congestion and improving mobility. Analyze the impact of transportation choices on air quality, energy consumption, and greenhouse gas emissions, and explore strategies for promoting alternative modes of transportation and reducing reliance on single$-$occupancy vehicles. Furthermore, examine the role of emerging technologies such as autonomous vehicles and transportation network companies in reshaping urban transportation systems. Finally, assess the challenges and opportunities in integrating transportation planning with broader urban planning goals to create more sustainable, equitable, and livable cities.