Final answer:
Drivers should check the tires on a placarded trailer with dual tires before every trip, and then typically every two hours or 100 miles during continuous travel for safety and maintenance purposes.
Step-by-step explanation:
Checking the tires on a placarded trailer with dual tires is crucial for safety and maintenance purposes. Federal regulations require that every time a vehicle with dual tires is prepared for a journey, the tires should be checked.
However, a good practice is to check tires at the start of every workday and every time the driver stops during a trip. The industry standard for drivers of commercial vehicles is to perform a tire check every two hours or 100 miles, whichever comes first, during continuous travel. This ensures that issues such as under-inflation, flat tires, or damage to the tires are identified early and addressed promptly to avoid accidents or breakdowns.
Not only does regular tire inspection help in maintaining consistent safety standards, but it also aligns with preventative maintenance programs to extend the life of the tires and improve fuel economy. By ensuring that tire pressure is at the manufacturer's recommended levels and inspecting for potential damage or wear, drivers can mitigate risks and downtime associated with tire failures on the road.