Backing & Maneuvering · Driver Training VideoSliding Tandems & Bridge Laws
Two trucks can carry the same total weight and only one is legal, because the bridge formula looks at axle spacing. Drivers learn axle limits, how sliding tandems shifts weight, locking pin checks, and why to cross a scale after every adjustment.
Branded with your logo & company nameWhat drivers learn
Every axle group has a federal weight limit. A single axle tops out at twenty thousand pounds. A tandem axle group — two axles working together — tops out at thirty-four thousand pounds. And gross vehicle weight on the interstate system caps out at eighty thousand pounds.
The other piece is the federal bridge formula. It doesn't just look at how much weight sits on an axle group — it looks at how far apart your axle groups are spread. Space your axles out, and the law lets you carry more weight on them.
That's where your sliding tandems come in. Moving the trailer tandem axle group changes both the spacing for the bridge formula and how the load's weight is split between your drive axles and your trailer axles.
Before you touch that slide, the locking pins have to be fully released on both sides, and after you reposition, both pins have to drop completely into the frame rail holes and lock again.
One more thing: the rules aren't identical everywhere. Off the Interstate, states set their own limits, and many add rules like kingpin-to-rear-axle length — California's forty feet is the famous one.
Your company standard: check both locking pins before you slide, and confirm both are seated after. Cross a scale any time you adjust tandems, switch trailers, or pick up a partial load — never estimate axle weights from memory.
Sample quiz questions
3 of the 10 questions drivers answer after the video. Quizzes run in the driver's own language.
- 12,000 lbs
- 20,000 lbs
- 34,000 lbs
- 40,000 lbs
Show answer
20,000 lbs
- 20,000 lbs
- 40,000 lbs
- 34,000 lbs
- 80,000 lbs
Show answer
34,000 lbs
- 100,000 lbs
- 34,000 lbs
- 73,280 lbs
- 80,000 lbs
Show answer
80,000 lbs
How fleets use this training
Pick Sliding Tandems & Bridge Laws and send each driver a personal link by email, or copy the link and text it yourself.
Drivers watch on their phone and answer the quiz in their own language. No app, no login.
They sign on screen and get a certificate with your logo. Every completion is saved for DOT and insurance.
Train your drivers on Sliding Tandems & Bridge Laws
Included in the Full Library plan ($129.99/mo, unlimited drivers). Unlimited drivers, cancel anytime. Prefer to own it? Order it branded for $4.99, one time.
Frequently asked questions
How long is the Sliding Tandems & Bridge Laws training video?
About 3 min. Drivers watch it on their phone from a personal link, then take a 10-question quiz.
Is there a quiz and a completion certificate?
Yes. Every driver takes a 10-question quiz in their own language, signs on screen, and gets a completion certificate with your company name and logo. Records are saved for DOT audits and insurance.
Which languages is it available in?
Ready today in English. You can also order it branded in any other language for $2.99 per extra language.
How much does it cost?
Included in the Full Library plan ($129.99/mo, unlimited drivers). You can also order this video branded with your logo and company name in the voiceover for a one-time $4.99, yours to keep.