Which of the following is LEAST likely to serve as a traffic calming strategy?

Cul-de-sacs are designed to limit through traffic, creating a safe environment that discourages high-speed travel. This physical configuration changes the flow of traffic, as vehicles cannot pass through but must turn around, leading to lower vehicle speeds adjacent to homes or areas needing traffic calming.

In contrast, speed humps and diagonal diverters are direct interventions aimed specifically at reducing vehicle speeds or redirecting traffic flows. Speed humps physically slow down vehicles, while diagonal diverters alter the paths that vehicles can take, often forcing them to make fewer or less direct movements in a manner that calms traffic.

Parking prohibition, while it can improve visibility at intersections or enhance pedestrian safety, does not inherently create a mechanism that slows down traffic the way that the other strategies do. Hence, while parking prohibition is a tactic that can contribute to safety and flow, it does not have the same direct impact on reducing vehicle speeds as the others listed.