Bobtail
Driving a tractor without a trailer attached.
Definition
Bobtailing refers to operating a semi-truck (tractor) without a trailer attached. This is common when driving to pick up a trailer or returning to a terminal after dropping one. Bobtailing requires extra caution as the truck handles differently without the weight of a trailer — braking distance is actually longer because the drive wheels have less traction without trailer weight pushing down on them.
Why it matters to you
Bobtailing feels lighter but stops worse: without trailer weight over the drive axles, traction drops and stopping distance goes up. Most jackknife incidents in yards happen bobtail on wet ground. It also matters for insurance — a tractor running without a trailer sits outside the carrier's normal liability, which is exactly what bobtail insurance exists to cover if you are leased on.
FAQ
What does Bobtail mean?
Driving a tractor without a trailer attached.
Why does Bobtail matter to a driver?
Bobtailing feels lighter but stops worse: without trailer weight over the drive axles, traction drops and stopping distance goes up. Most jackknife incidents in yards happen bobtail on wet ground. It also matters for insurance — a tractor running without a trailer sits outside the carrier's normal liability, which is exactly what bobtail insurance exists to cover if you are leased on.
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