What are the rough areas built into the roadway to warn drivers to stop or slow down called?

The correct term for the rough areas built into the roadway that serve as a warning for drivers to stop or slow down is speed bumps. Speed bumps are specially designed road features that create a physical obstacle, compelling drivers to reduce their speed, thus enhancing safety in areas where slower movement is necessary, such as near schools, residential zones, or construction sites.

The other options, while related to road safety, serve different purposes. Road signs provide important information, instructions, or warnings to drivers without altering the roadway's physical structure. Warning strips, which could refer to tactile indicators or surface markings, primarily assist pedestrians or alert drivers to potential hazards, but are not the same as speed bumps. Traffic cones are typically used to divert or guide traffic rather than serve as a deterrent to speed.