The requirement to signal continuously during the last 100 feet before turning at an intersection is a key aspect of safe driving practice. Here are the exceptions you've mentioned:
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Unless your turn is protected by a green arrow: If you have a green arrow, you have the right of way to turn, and signaling is not necessary since other drivers should already be aware of your intention to turn.
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Unless you are in a designated turn lane: If you are in a lane specifically marked for turning, it is generally understood that you will turn, so continuous signaling may not be required.
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Even if you do not see other vehicles around: It's important to signal even if you think no other vehicles are nearby. This can ensure that any pedestrians or cyclists are aware of your intentions.
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Unless you are traveling faster than other traffic: This statement can be misleading. Regardless of your speed, signaling is important to communicate your intentions to other road users, ensuring safety and preventing potential accidents.
In summary, signaling your intent to turn is crucial to maintaining safe driving practices, and these exceptions should be applied thoughtfully and in the context of traffic laws and safety regulations.