Final answer:
Effective ways to maintain speed going uphill or downhill include engaging overdrive or shifting to a lower gear, avoid riding the brakes.
Explanation:
Riding the brakes is not an effective way to maintain your speed when going uphill or downhill because it can lead to loss of control, overheating, and wear on the brakes. Engaging the overdrive or shifting to a lower gear are better options. Engaging the overdrive can improve fuel efficiency, while shifting to a lower gear increases the engine's RPM and provides more power for climbing hills or controlling speed downhill.
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