Why are cars a major transportation challenge for modern cities?

Cars present a significant transportation challenge for modern cities because they compete for scarce urban space while causing chronic congestion, chaotic parking, and noise pollution. Their widespread use has led to urban sprawl, a pattern of low-density development that increases travel distances and necessitates further reliance on private vehicles.12

This automobile dependence creates several critical issues:

• Environmental Impact: Excessive car use contributes to air pollution and increased energy consumption, while the infrastructure required to support cars—such as highways and parking—destroys natural habitats and fragments ecosystems.123
• Social and Economic Costs: Reliance on cars makes walking and cycling more difficult and dangerous, despoiling public environments. Furthermore, it creates mobility barriers for those who cannot drive, such as the elderly, the young, or those who cannot afford a vehicle.13
• Efficiency: Compared to mass transit, cars are highly inefficient in their use of space and energy, as they typically carry fewer than two occupants.3

To address these challenges, many cities are shifting toward more sustainable models, such as transit-oriented development and the promotion of non-motorized transport.145