What benefit do blocking vehicles provide at an incident scene?

Blocking vehicles play a crucial role in enhancing the safety and efficiency of an incident scene by providing additional advance warning to approaching traffic. When these vehicles are strategically positioned, they serve as a visual alert for drivers, allowing them to recognize that there is a hazard ahead and encouraging them to slow down or change lanes well in advance. This proactive caution not only helps prevent secondary accidents but also creates a safer environment for both responders and motorists.

The advantage of additional warning is significant as it allows time for drivers to react appropriately, promoting a smoother traffic flow around the incident while supporting the safety measures necessary when responding to emergencies. By alerting approaching traffic early, blocking vehicles effectively manage the scene and help prevent further incidents from occurring.

In contrast, while reducing lane availability and increasing congestion can be by-products of blocking vehicles, they are not the primary benefits. The emphasis is placed on warning and cautioning traffic, rather than merely changing traffic patterns or causing delays.