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Question:

What is the best way to figure out how many seconds of following distance you have?

A Wait until a vehicle passes a shadow or landmark and count the seconds until you pass it.
Explaination

Count how long it takes you to reach the landmark after the car in front of you by counting in seconds, "one-thousand-and-one, one-thousand-and-two." All of the other ways are risky and will not provide you with an accurate following distance. Remember to increase your following distance when driving in traffic, in bad weather, with heavy vehicles, or at greater speeds.