What is the correct way to stop at a red light with an automatic transmission?

[MacEliza]

When encountering a red light with an automatic transmission, the correct stopping methods are to shift into neutral and engage the handbrake, or to remain in D gear while applying the brakes. The neutral gear and handbrake method is suitable for situations where the light has just turned red or when there is a long remaining duration for the red light. Staying in D gear and applying the brakes is appropriate when the red light has about ten seconds left or during stop-and-go traffic, allowing for a prompt start without frequent gear changes. Automatic transmission vehicles automatically select the appropriate gear based on the car's speed and traffic conditions, adjusting the transmission according to the degree of accelerator pedal pressure and speed changes. The driver only needs to control the speed using the accelerator pedal.

[FelixLynn]

When waiting at a red light, I usually shift to N gear and engage the handbrake. Keeping it in D gear while stepping on the brake causes the transmission fluid temperature to rise rapidly, which is particularly bad for the transmission. I generally don't turn off the auto start-stop system, but remember not to forcefully turn the steering wheel when the engine is off. For long red lights exceeding 30 seconds, shifting to N gear allows the transmission to rest, and using the handbrake gives your right foot a break. If rear-ended while in P gear, the transmission's locking mechanism can be severely damaged, costing thousands to replace. For short red lights, I simply stay in D gear and hold the brake, as frequent gear shifts also strain the transmission.

[MacLuna]

When waiting at a red light while driving, I mainly handle it in three ways: For short red lights under 10 seconds, keeping it in D gear and stepping on the brake is the most convenient; for red lights over 20 seconds, shift to N gear and engage the handbrake to let the car fully relax; if the auto start-stop function is on, simply press the brake firmly to let the engine shut off. A key reminder for drivers with auto-hold function: don't press the accelerator to release the hold before the red light is about to end, as there are many electric scooters rushing through the intersection, which is very dangerous. Also, don't take the easy way out by shifting to P gear while waiting for the light—I've seen too many cases where the transmission was completely destroyed in a rear-end collision.

[McNadia]

As a driver with ten years of experience, there are three key points to the correct posture when waiting at a red light: Safety first, always pull the handbrake firmly; To protect the transmission, shift to neutral; For red lights exceeding 30 seconds, it is recommended to turn off the engine. Special note: Shifting an automatic transmission to P (Park) while waiting at a red light is actually very dangerous. In the event of a rear-end collision, the impact force is entirely borne by the locking hook inside the transmission, and if it breaks, the repair cost could cover half a year's worth of fuel. Be extra cautious at sloped intersections—when in neutral, the transmission gears are disengaged, making it more effective at preventing the car from rolling than in D (Drive) mode. When using auto start-stop, pay attention to whether the air conditioning performance might deteriorate.

[Adeline]

The core of dealing with red lights in an automatic transmission is to avoid continuous stress on the gearbox. When in D gear with the brake pedal pressed, the torque converter remains in working condition, easily pushing oil temperature beyond 120°C. The correct approaches are: Activating the auto-hold function in AUTOHOLD mode is the most worry-free; For manual operation, shifting to N gear + engaging the electronic parking brake is the safest; Vehicles equipped with auto start-stop simply require a firm press on the brake pedal. Remember never to shift to P gear—two years ago, a Lexus was rear-ended, causing the transmission's parking pawl to snap directly, with a replacement gearbox quoted at 80,000 RMB. For red lights shorter than 15 seconds, staying in D gear has minimal impact.

[FrankFitz]

Follow these four steps at a red light: After stopping by pressing the brake, immediately shift to N (Neutral), engage the handbrake, and then release the foot brake. For short red lights, perform this operation once; if the wait exceeds 30 seconds, it's recommended to turn off the engine directly. Key reminders: Shifting to P (Park) can easily damage the transmission lock mechanism; if the auto start-stop is active and air conditioning is needed, the engine will restart automatically—no action required; on steep slopes, using the electronic handbrake can prevent rolling back. In neutral, an automatic transmission vehicle disconnects power, saving at least 15% in fuel consumption compared to keeping it in D (Drive), and it also provides the best protection for the transmission.