Professional Driver's Handbook

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Connecting vehicles

Draw-bars or coupling devices must be in accordance with legislation. These devices should be of sufficient strength to hold the vehicles together and be fastened to integral parts of the frames of the vehicles: you should not draw or tow a trailer or special mobile machine unless the attachment for connecting the draw-bar of the trailer or special mobile machine to the motor vehicle is firmly and directly affixed to the frame of the vehicle.

When a coupling device is used (other than the fifth-wheel coupler of a semi trailer unit), an auxiliary chain or metal cable of equal strength to the coupling device should also be used.

Except for a motor vehicle pulling a pole trailer, the draw-bar or other connection between the motor vehicle and the trailer should not exceed 1.83 m (6 ft.) in length.

Swerving and whipping - the trailer must not swerve or whip unreasonably when being towed by a motor vehicle.

If the trailer whips or swerves, slow down and stop to determine the cause.

Note: All trailers equipped with brakes must have a device to apply the brakes automatically if the unit should become disconnected.


Rev: 2017