How do you get the aggregate working load limit for a commercial motor vehicles?

Answer

I've never heard of an aggregate working load limit for a vehicle.

The only place that term is used in the Federal Motor Carrier Safety Administration Reglations is in the load securement section.

If that is what you meant, it's pretty simple. Most tiedowns and chains should be marked with their Working Load Limit. If they are, you simply add them up.

Five synthetic straps with Load Limits of 7,000 pounds each equals an aggregate working load limit of 35,000 pounds. In most cases, your aggregate working load limit must be at least 50% of the total weight of what you are carrying. In this case, these 5 tiedowns' load limit would be enough for something weighing 70,000 pounds.

If you don't know what the Load Limits are, you can go to 393.108 in the regulations. They have a list of tiedown types and sizes. If the tiedown is not marked, you must use the assigned rating from the regs.

You need to check 393.100 through 393.136 though. Many commodities, such as bundled lumber, vehicles, heavy equipment, have specific requirements in addition to the genereal load limit requirements.

Also, keep in mind, if you are inspected and your load is not secured sufficiently, it is an Out of Service Violation and you can probably count on being issued a ticket, being parked where you are, and your company's safety rating going down.

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