Illinois CDL Practice Exam.

The correct guideline for securing a flat-bed load states that you need at least one tie-down for every 10 feet of cargo. This requirement ensures that the cargo is adequately restrained during transport, minimizing the risk of shifting or falling off the flatbed trailer, which can lead to accidents or loss of cargo. Having a sufficient number of tie-downs helps to distribute the forces acting on the cargo, particularly during sudden stops or cornering, which can shift the load. It's important to ensure that loads are properly secured not only for the safety of the vehicle and driver but also for the protection of other road users. The other options either suggest an insufficient number of tie-downs or assert that no tie-downs are needed, which would not comply with safety regulations and best practices in cargo securement.