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How to drive through floods?

What is the recommended driving technique for safely negotiating deeper standing water on roads? Splash or trickle? Most drivers seem to prefer splash but trickle seems more sensible to me.

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If you are driving a diesel car, extremely slowly and do not drive in water that reaches any of the air intakes of the engine. Obviously if you are driving a 4x4 designed for fording rivers you don't have that problem.
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