What is an effective method for assessing the sufficiency of following distance?

When the vehicle in front passed a tree or landmark, you start counting the second it take for you to get to the same location.

Use the shadow of the vehicle in front to estimate the distance.

Wait for the vehicle in front to signal a turn and then count the time It takes for the turn to be completed.

Bring out a calculator and calculate the traveling speed into feet per second

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