Which of the following is a suitable control measure to minimize risks when using mechanical land transport?

Designated rest periods are a suitable control measure for minimizing risks associated with mechanical land transport. This practice is vital for ensuring that drivers are well-rested and alert, reducing the likelihood of fatigue-related accidents. Fatigue can significantly impair a driver's judgment, reaction times, and overall ability to safely operate a vehicle. Establishing scheduled breaks allows drivers to recuperate, which is especially important during long journeys or in high-pressure environments.

In contrast, random vehicle checks, while beneficial for vehicle maintenance and safety enforcement, do not directly address driver fatigue or health—key components in transport safety. Frequent changes in traffic routes might lead to unfamiliarity and increased risk if drivers are not adequately prepared for new conditions. Ignoring speed limits is fundamentally unsafe and undermines legal and safe driving practices, making it an inappropriate and dangerous control measure.