What does a "No Turn on Red" sign indicate?

Answer: B — Drivers must stop and wait for a green light

A "No Turn on Red" sign indicates that drivers must stop and wait for a green light before making a turn at the intersection. This sign is specifically placed to enhance safety and manage traffic flow at specific intersections where turning on red may pose risks, such as visibility issues or high pedestrian traffic. In areas where this sign is posted, drivers are legally obligated to adhere to its directive and cannot turn until the signal indicates it is safe to do so. This rule helps reduce the likelihood of collisions that could occur from turning without a clear view of oncoming traffic or pedestrians crossing the road. The other options reflect misunderstandings of the sign's instructions. For example, turning on red with caution is explicitly prohibited by the sign, as is making a turn right on red when such turns aren't allowed. Additionally, the notion of proceeding with a left turn on red is only permissible under specific circumstances (like from a one-way street onto another one-way street) and is not indicated by a "No Turn on Red" sign.