Final answer:
Traffic signals, hazard signs, and emergency vehicles are some things that alert drivers to dangerous conditions or tell them to stop.
Step-by-step explanation:
When driving, there are several things that can alert drivers to dangerous conditions or tell them to stop. One example is a traffic signal, such as a red light or a stop sign. These signals indicate that drivers should stop their vehicles until it is safe to proceed. Another example is a hazard sign, which warns drivers of potential dangers on the road, such as sharp turns or slippery surfaces. Lastly, emergency vehicles, such as ambulances or firetrucks, use sirens and lights to alert drivers to dangerous conditions and inform them to pull over and let the emergency vehicle pass.