A recent analysis of traffic accidents in Metro City revealed that intersections with traffic lights have fewer accidents than those without. The report concludes that installing more traffic lights would reduce the overall number of accidents in the city.

While this conclusion seems valid, city planners have noted that other factors, such as road conditions and driver behavior, also contribute to the frequency of accidents. To strengthen the argument that adding traffic lights will lead to fewer accidents, it is essential to consider how the presence of traffic lights might impact these other factors.