What question did this study set out to answer?

The aim is to assess how public policies, particularly petrol prices, influence road traffic levels in Greater London.

February 28, 2026

Estimating the Influence of Public Policy on Road Traffic Levels in Greater London

Key Points

The aim is to assess how public policies, particularly petrol prices, influence road traffic levels in Greater London.
Analysis of road traffic data in relation to petrol price changes.
Comparison of bus and car usage to identify factors affecting transport choices.
Evaluation of peak versus off-peak traffic patterns.
Road traffic levels are sensitive to changes in petrol prices.
Bus service quality significantly influences the decision to switch from bus to car.
Peak period traffic is not reduced by increased petrol prices, as savings occur mainly during off-peak times.

Abstract

Road traffic is found to be sensitive to petrol price increases. Service is twice as important as fares in determining transfer from bus to car. Increases in petrol prices do not offset extra peak period traffic, as petrol savings are made largely in off-peak times.

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