Negatives:
* Reduced Mobility: This is the most obvious impact. Travel would be significantly slower and more limited. Commuting to work would become a major challenge for many, potentially requiring much longer travel times via public transport, cycling, or walking. Access to remote areas would be severely restricted.
* Economic Disruption: The automotive industry, along with related sectors like oil and gas, insurance, and roadside assistance, would collapse, leading to massive job losses. Businesses relying on efficient transportation of goods would face significant challenges, leading to increased prices and potential shortages.
* Environmental Impacts (Potentially Mixed): While air pollution from car exhaust would decrease, the increased reliance on other modes of transportation could have other environmental consequences. Increased demand for public transport could strain resources and energy consumption. Increased freight transport by train or ship could lead to different kinds of pollution.
* Social Changes: Suburban sprawl would likely be reversed as people would need to live closer to their jobs and essential services. Social interaction could be altered, as spontaneous car trips for social gatherings would become less common.
* Increased Congestion on Alternative Transport: Public transportation systems would be massively overloaded unless significantly expanded, leading to overcrowding and delays. Bicycle and pedestrian infrastructure would require significant investment to accommodate increased usage.
* Accessibility Issues: People with disabilities who rely on cars for mobility would face significant challenges.
Positives:
* Improved Air Quality: A significant reduction in air pollution and greenhouse gas emissions is a major potential benefit.
* Increased Physical Activity: More people would be walking and cycling, leading to improvements in public health.
* Quieter Cities and Towns: The constant noise pollution from traffic would be greatly reduced.
* Safer Streets: Fewer traffic accidents and fatalities would occur.
* Re-imagining Urban Spaces: Cities could be redesigned with more pedestrian-friendly areas, green spaces, and better public transportation infrastructure.
In short: Life without cars would be a fundamentally different experience. While it would likely improve some aspects of life, particularly environmental quality and public health, it would also present significant challenges in terms of mobility, economics, and accessibility. It would necessitate a complete reorganization of how we live, work, and interact with our environment. The overall outcome would depend heavily on how effectively societies adapted to the change.