What does a red traffic light signify?

A red traffic light signifies that drivers must come to a complete stop at the intersection. This rule is fundamental to traffic safety, as it prevents accidents by clearly indicating to drivers that they cannot proceed until the light changes. Stopping at a red light allows for the safe passage of cross traffic, emergency vehicles, and pedestrians. This rule is vital for maintaining order and safety on the roads, as ignoring it can lead to serious collisions and violations of traffic laws.

The other options do not accurately convey the requirement of stopping. Proceeding with caution, yielding to oncoming traffic, or slowing down without stopping could lead to dangerous situations and is contrary to the regulations governing traffic lights. Always adhering to the red light rule ensures a safer driving environment for everyone.