What are the factors that influence a driver to change up or down a gear?

1. AThe consideration to change up or down a gear is influenced only by the accumulated distance of travel.
2. BWhen the vehicle is driving uphill the consideration to change up or down a gear does not exist.
3. CThe maximum permitted speed on that road section.
4. DThe vehicle's speed, taking into account the traffic situation, road conditions and visibility conditions.

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