Here are some tips on how to safely make a left turn:
As you approach turn with signal on, watch for drivers who may misinterpret this signal as an intention to turn somewhere before your intended turning point.
Don't start turning until there is enough time for the rear of the vehicle to clear the intersection without forcing opposing drivers to slow down or swerve.
Don't assume opposing driver will see you. They may be looking elsewhere.
Be careful that improper tracking does not cause the vehicle or trailer to interfere with pedestrians and other vehicles.