Why Does an Automatic Transmission Car Roll Backward When Starting on a Slope?

[VanAriana]

Automatic transmission cars may roll backward when starting on a slope due to insufficient fuel supply. The driver should apply the throttle appropriately to ascend the slope. If only the D (Drive) gear is engaged without applying throttle, the idle speed might be insufficient to propel the vehicle uphill, causing it to roll backward. Automatic transmissions eliminate the need for manual gear shifting by the driver, as the vehicle automatically selects the appropriate gear based on speed and traffic conditions. Typically, automatic transmission cars have six gear positions arranged from top to bottom: P (Park), R (Reverse), N (Neutral), D (Drive), S (Sport), and L (Low). For general driving needs, using the P (Park), R (Reverse), N (Neutral), and D (Drive) gears is sufficient. However, special driving conditions may require the use of other functional gears.