What type of control would be most effective in ensuring cars do not collide with pedestrians?

Choosing physical controls as the most effective means to prevent cars from colliding with pedestrians is grounded in the nature of these controls. Physical controls are tangible structures or barriers that can be implemented in the environment to directly reduce or eliminate hazards. Examples include crosswalks, traffic signals, speed bumps, and pedestrian barriers. These measures physically separate vehicles from pedestrians or regulate the flow of both to ensure safer interactions.

In this context, physical controls provide direct intervention in the driving and walking environment, thus lowering the risk of accidents effectively. They are easily observable and enforceable, allowing both drivers and pedestrians to understand the designated spaces for each.

Other types of controls, such as administrative measures (like policies or training), technical solutions (like warning systems or sensors), and nuanced approaches (which might suggest a blend of controls or more advanced strategies), can support safety but do not have the same immediate and tangible impact on preventing collisions as physical controls do.