WasteWatcher-Safety (Devices) Chains

Truck Driver's Guidebook
Safety Devices
Federal Motor Carrier Safety Regulations (FMCSR)
Table of Contents

Full trailers and dolly converters

arrangement of one if safety chains or cables are used

More information about coupling devices and towing methods are found in Part 393 of the FMCSR.

Driveaway-towaway operations

Tow-bars shall be plainly marked by the manufacturer
Must be equipped with a safety device that prevents the towed vehicle from breaking loose in the event the tow-bar fails or becomes disconnected. The safety devices:
- shall be equipped with at least two safety chains or cables, if used
- Shall be crossed if chains or cables are used
- Must not have more slack than necessary to permit the vehicles to turn properly (never twist or knot a chain)
More information about coupling devices and towing methods are found in Part 393 of the FMCSR.

Must be equipped with safety device that prevents accidental separation
Must be equipped with safety device that prevents the towed vehicle from breaking loose in the event the tow-bar fails or becomes disconnected and must:
- Not be attached to the pintle hook or any other device on the towing vehicle to which the tow-bar is attached
- Not have more slack than necessary to permit the vehicles to turn properly (never twist or knot a chain)
- Have the ultimate strength of not less than the gross weight of the vehicle or vehicles being towed
- Be connected to the towed and towing vehicle in a manner to prevent the tow-bar from dropping to the ground in the event it fails or disconnects
- Have the towed vehicle be equipped with two safety chains or cables or a bridle

NOTE: Crossing of safety devices is always required in a driveaway-towaway operation.

Should the coupling device become detached during travel, crossed safety devices (Figure 2) will minimize the lateral movement of the towed vehicle as illustrated in Figure 3 where the safety devices are not crossed.

NOTE: Refer to the FMCSR for complete details concerning the proper use of safety devices.

Table of Contents

Due to frequent changes in federal and state regulations, the Michigan Center for Truck Safety cannot ensure the accuracy of the material contained in the Guidebook beyond the date of publication. For current information, contact the Center at (800) 682-4682. This document is not intended for legal purposes.

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