Which signal is used to indicate a traffic jam or blockage?

The correct signal to indicate a traffic jam or blockage is indeed Signal 32. This particular signal plays a crucial role in ensuring that drivers are aware of hazardous conditions on the roadway, allowing them to take appropriate actions to avoid potential accidents or delays. When this signal is active, it not only alerts drivers to the current situation but also serves as a warning for them to proceed with caution. Understanding these signals is vital for safe navigation, especially in situations where traffic flow is disrupted.

The other signals listed serve different purposes, such as other types of incidents or conditions, making it important for drivers to familiarize themselves with various signals in order to react appropriately in different scenarios.