As you increase the speed of your car the engine has to operate at higher and higher speeds in order to move the car along If the engine was left in a low gear the speed could become so excessive tha?

that it could cause the engine to over-rev, potentially leading to mechanical failure or damage. Higher speeds in low gear may also result in decreased fuel efficiency and increased wear on engine components. To prevent these issues, it is essential to shift to a higher gear as the car's speed increases, allowing the engine to operate within its optimal RPM range. This ensures smoother performance and prolongs the lifespan of the engine.