The correct rule to determine safe following distance is the 2-second following rule, which advises maintaining a gap equivalent to 2 seconds from the vehicle ahead.
The rule you should use to determine if there is enough space between you and the vehicle you are behind is the 2-second following rule. This rule states that you should maintain a distance equivalent to at least 2 seconds from the vehicle in front of you.
For example, if the vehicle in front of you passes a stationary object, you should count 'one thousand and one, one thousand and two' before you pass the same object to ensure you have enough space between the two vehicles.
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