Evidence keeps mounting that congestion pricing can catalyze major reductions in traffic crashes. A year ago I reported on research that vehicle crashes in central London fell as much as 40 percent since the 2003 startup of London’s congestion charge. The same researchers are now expressing the safety dividend in terms of falling per-mile crash rates, and the figures are even more impressive.
The researchers — economists associated with the Management School at Lancaster University in northern England — compared crashes within and near the London charging zone against 20 other U.K. cities, before and after 2003. Their conclusion: Since the onset of congestion charging, crashes in central London fell at a faster rate than the decrease in traffic volumes. As important as the reduction in traffic has been for safety, at least as much improvement is due to the lower crash frequency per mile driven.
In short, driving in the London charging zone isn’t just smoother and more predictable, it’s safer. And safer for cyclists as well as drivers, with the number of people on bikes expanding considerably as car volumes have fallen.
The research reported last year was compiled in a working paper, Traffic Accidents and the London Congestion Charge. The new results stressing crash rates (per mile driven or bicycled), rather than crash numbers, appear in the paper’s final, peer-reviewed version published in January in the Journal of Public Economics.
Here are key findings: