Rising congestion and urban pollution have prompted proposals to raise petrol prices as a deterrent to car use. While higher fuel costs may influence travel behaviour, I largely disagree that this is the best solution, because its effects are uneven and insufficient without complementary measures that reshape transport systems.

Price signals reduce discretionary driving by increasing the marginal cost of each journey, encouraging carpooling or a shift towards public transport. For instance, commuters might consolidate errands or choose buses when fuel becomes expensive, which lowers traffic volumes and emissions in the short term. This approach is administratively simple and generates public revenue that could support environmental initiatives.

However, petrol price rises disproportionately burden low-income and peripheral residents who lack viable alternatives, whereas wealthier drivers often absorb the extra cost and continue driving. Moreover, congestion is shaped by land use patterns, road capacity, and service quality, so fuel pricing alone fails to resolve peak-hour bottlenecks or highly polluting vehicle fleets. Targeted policies such as congestion charging, sustained investment in reliable public transport, and stricter emission standards more directly alter travel choices and technology, delivering durable reductions.

Overall, increasing petrol prices contributes to addressing traffic and pollution, but it is not the most effective or equitable primary tool. A balanced strategy that prioritises transport alternatives and targeted regulation, with fuel pricing as a supportive measure, is far more likely to achieve lasting urban improvements.