Which type of urban development includes a system designed for travel without entering the central city?

The correct answer is the beltway, which refers to a type of urban development characterized by a circular or ring road that surrounds a city, facilitating travel around the periphery rather than routing through the central area. Beltways are often designed to ease traffic congestion in the city center by providing an alternate path for commuters and travelers, allowing them to bypass the core urban zone. This type of development is particularly crucial in metropolitan areas where the central city may experience heavy traffic or where urban sprawl has led to increased travel distances to suburban areas.

In contrast, the other choices relate to varying concepts in urban planning or organization but do not specifically denote systems designed for travel circumventing a central city. Field patterns and star patterns describe spatial arrangements of urban areas and their distribution but do not imply a travel system. A megalopolis refers to a large metropolitan area formed by the merging of several adjacent cities or urban areas, but again does not focus on travel systems. Thus, the emphasis on a designed system for travel without entering the central city makes the beltway the appropriate answer.