When driving a vehicle, proper use of the left turn signal is a crucial step to ensure road safety. This action activates the left turn indicator on the dashboard and causes the vehicle's exterior left turn signal to flash, alerting other road users that the vehicle intends to turn left or change lanes. The turn signal must be activated at least 3 to 5 seconds before executing a turn, lane change, or U-turn to provide sufficient reaction time for following vehicles. Upon completing the manoeuvre, the turn signal typically deactivates automatically. If it fails to reset, manually return the lever to its neutral position. Prior to using turn signals, drivers should assess their surroundings to ensure safety, while also conducting regular checks to confirm the bulbs are functioning properly - this prevents accidents caused by unclear signals during adverse weather conditions. Proper turn signal usage is not merely a legal requirement under traffic regulations, but more importantly demonstrates responsibility for both personal and others' safety.