Wedges and shims are primarily used for what purpose in extrication?

Wedges and shims play a critical role in stabilizing vehicles during extrication efforts. When a vehicle is compromised or in an unstable position, the use of wedges and shims aids in providing additional support to the cribbing systems already in place. By inserting these devices into gaps and crevices, rescuers can effectively create a stable base, preventing unwanted movement of the vehicle as they work to extricate trapped individuals. This is essential for ensuring both the safety of the rescue team and the individual being rescued.

The other options are not the primary function of wedges and shims. While creating barriers against hazards may involve other tools or methods, and communication is typically managed through radios and verbal cues rather than physical devices, reducing the weight of equipment is not related to the application of wedges and shims within the context of extrication. Thus, the use of wedges and shims as a means of supplementing cribbing for stability directly supports the overall mission of safe and effective rescue operations.