Counterfactual without a comparison group

“Following the approval of Bill 56, Building a More Competitive Economy Act, 2025, all automated speed enforcement cameras were deactivated on November 13, 2025. The city has since been collecting and analyzing speed data at the original eight pilot locations to evaluate the impact of the camera removals. Monthly updates are provided for each site, including average speed, 85th percentile speed, speed-limit compliance rates, and the proportion of high-end speeders. This data is presented alongside baseline conditions prior to ASE camera installation and results observed during the enforcement period.”

Data here (hat tip @sjamieit.bsky.social). Here’s a pic, drawn using ggplot in R.