Restricting car ownership to one vehicle per family is often proposed as a solution to traffic congestion and air pollution. I largely disagree with this approach because it is a blunt policy that overlooks varied household needs and delivers limited environmental benefits compared with targeted transport reforms.

First, a uniform cap ignores differences in geography, employment and family structure. In suburban or rural areas with weak public transport, multiple cars may be essential for work, education and caregiving. A strict limit would reduce mobility and economic participation without guaranteeing fewer journeys, as families may still travel the same distances at peak times. Moreover, congestion is caused by road use, not ownership itself, so a second car parked at home does not necessarily worsen traffic.

Second, the environmental impact of such a restriction is uncertain and potentially inequitable. Wealthier households could retain newer, cleaner vehicles, while larger or lower-income families would bear disproportionate inconvenience. In contrast, policies that price road use directly, such as congestion charging, low-emission zones and fuel taxation, discourage unnecessary trips and favour cleaner technology. For example, cities that combine reliable public transport with demand-based pricing have achieved measurable reductions in traffic and emissions without rigid ownership rules.

In conclusion, limiting families to one car is an inflexible and socially uneven measure. Effective congestion and pollution reduction requires policies that manage usage, expand alternatives and incentivise cleaner travel, rather than imposing a simplistic ownership cap.