What is a significant advantage of using restraint devices both on and off duty?

Using restraint devices both on and off duty provides greater control of the vehicle, which is crucial for the safety of the operator and others on the road. When drivers are properly restrained, they are less likely to be injured during sudden maneuvers or accidents. This stability allows them to maintain better control over the vehicle, especially in high-pressure situations that emergency responders often encounter.

Additionally, having greater control helps the driver react more effectively to unexpected changes in the environment, such as the actions of other drivers or obstacles in the roadway. Ultimately, this not only enhances personal safety but also contributes to safer driving practices, which is essential for emergency vehicle operations where the stakes can be exceptionally high.

The other options do not directly relate to the primary purpose of restraint devices. Fuel economy, communication skills, and speed are not improved by the use of restraints and do not reflect the critical safety advantages that properly restraining oneself while driving provides.