Should an automatic transmission car be shifted to neutral when waiting at a red light?

[MacJack]

When waiting at a red light in an automatic transmission car, if the expected waiting time is more than 30 seconds, you should shift to neutral and engage the handbrake. Do not use the P (Park) gear, as in the event of a rear-end collision, the automatic transmission could be severely damaged. The damage may not be immediately apparent, and issues often only surface after the bumper is repaired and the car is back on the road, making claims troublesome. If the waiting time is short, there is no need to shift to neutral. Additional Information: Here is some related information about the N (Neutral) gear: The N gear is defined as neutral and is used for temporary parking: This gear is located between the R (Reverse) and D (Drive) gears. It can be engaged when waiting at a traffic light or for parking periods exceeding 30 seconds, with the purpose of cutting off power transmission between the input and output shafts inside the transmission.

[StCaleb]

After driving for so many years, I often encounter situations where I have to wait at red lights, especially during rush hours. When waiting at a red light in an automatic transmission car, do I need to shift to neutral? From my experience, for short red lights, like 10-20 seconds, it's perfectly fine to stay in D gear and keep the brake pedal pressed. There's no need to shift back and forth, which saves trouble and reduces wear on the shifting mechanism. However, if the red light lasts more than 30 seconds, like those long red lights at major intersections, I would push the gear lever to N gear. This allows the transmission to take a break, reducing internal oil pressure and temperature buildup, which can protect the car in the long run. Additionally, manuals generally recommend this practice as it can help reduce fuel consumption. Safety comes first when driving, so don't get distracted by shifting gears and cause an accident. But developing good habits is important and can save you money on car repairs.

[McChloe]

When waiting at a red light with an automatic transmission, I always prioritize safety and comfort. In D (Drive) gear, although the engine is idling, there's slight power transmission in the gearbox, making it tiring to keep pressing the brake pedal—especially during long-distance driving. Shifting to N (Neutral) and engaging the handbrake allows complete relaxation of the foot while preventing any risk of rolling, particularly on slopes. Safety should always come first, so I recommend this practice for new drivers to cultivate good habits and minimize errors. This approach slightly reduces fuel consumption and eases the transmission's workload. However, avoid frequent gear shifts to prevent unnecessary wear—just strike a balance. Remember: no need to shift for brief stops, but act decisively for long waits.

[JakeFitz]

Based on my analysis of automatic transmission operation, I understand that when idling in D gear, the pump wheel continues to rotate, causing continuous fluid flow and heat accumulation. Shifting to N gear can disconnect power transmission, reduce oil pressure and temperature, and extend component lifespan. It's beneficial for system health to shift down when waiting at long red lights. It's recommended to adjust based on red light duration: stay in D gear for short waits, and easily shift to N gear for longer stops.

[McAlan]

In daily commuting, I rarely shift to neutral at red lights when driving an automatic transmission car, unless it's an exceptionally long red light, like over 60 seconds. For short traffic lights at intersections, I usually can't be bothered to move the gear lever as shifting is troublesome and disrupts the driving rhythm. However, my driving instructor taught me that shifting to N gear and applying the handbrake can reduce brake wear and fuel consumption, so developing this habit can be beneficial. Everyone should handle it flexibly based on the situation.

[McMaggie]

As someone who cares about environmental protection and fuel efficiency, I believe it's necessary to shift to N gear at red lights for automatic transmissions. Reducing engine load can decrease fuel consumption by about 10%, which is environmentally friendly by reducing emissions. The global trend encourages minimizing idle time. Switching gears saves resources during long red lights, while staying in gear is fine for short ones.