This gives you a bit more manual control over the transmission than you otherwise would on an automatic. Times you might use it are situations when you want to keep the car in a low gear. For example: descending a long hill can overheat your brakes. Downshifting provides more engine braking and allows you to not ride the brake so much. Downshifting is also a really important skill to have if you drive in snow. When the road is ice, slamming on your brakes can lead to a skid. Downshifting and being a bit more gentle on the brakes helps you slow down more quickly and remain in control. One last situation I can think of: you’re towing something heavy and trying to maintain speed uphill. Your car may upshift and downshift at the wrong times. Keeping the car in a low gear will help it pull better. This is what “Overdrive Off” switches mitigate.
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