B. They reduce the need for a highway system within a city's central business district.
By creating roadless areas within a city, there is less need for extensive road infrastructure, reducing congestion, air pollution, and the overall carbon footprint of the city. This can lead to a more sustainable urban environment by promoting alternative modes of transportation such as walking, biking, and public transit.
How do such roadless areas make a city more sustainable?
A. They provide high-density urban areas with space for outdoor recreation.
B. They reduce the need for a highway system within a city's central business district.
C. They encourage the use of mass transit over other forms of transportation in a city.
D. They reduce the commute time between the suburbs and a city's central business district.
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