Why Turn on the Left Turn Signal in the Fast Lane on the Highway?

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Reasons for turning on the left turn signal in the fast lane on the highway are as follows: Signaling to the rear vehicle: When driving in the fast lane, if you notice from the rearview mirror that a vehicle in the right lane wants to change lanes into the fast lane but is hesitant due to fear of sudden right lane changes, you can turn on the left turn signal to indicate that you have no intention of changing lanes to the right. This allows the other vehicle to change lanes with confidence. Alerting the front vehicle: To remind the vehicle ahead, nowadays, there are quite a few drivers who occupy the fast lane for extended periods or even drive at very low speeds in the fast lane. This poses significant risks to normal traffic flow. Therefore, turning on the left turn signal at this time serves as an effective reminder for the other vehicle to move away quickly.