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I've driven over 750 000 km and have found tailgating one of the most stressful experiences, particularly on dual carriageways that have two lanes. If you are travelling at 110 km in the centre lane (the speed limit) and the car in the gutter lane is travelling the same speed then neither you nor the other motorist is obliged to do anything especially when their lane is full. So speeding motorists and tailgaters back-off. Further-more if you speed-up to try and move left to let the tailgater overtake, you'll never get back as the tailgaters travel dangerously close, hanging onto each other's bum fluff.