The 4-second rule in the New Zealand Road Code dictates the minimum safe following distance you should maintain behind the vehicle ahead of you under adverse driving conditions. While a 2-second gap is recommended for dry, ideal roads, you must extend this to 4 seconds when traveling on wet, slippery, unpaved roads, during heavy rain or low visibility, or when towing a trailer or caravan. To check your distance, pick a fixed roadside landmark and count seconds; if you pass it in less than four seconds, you are following too closely and risk a collision.
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