I think that if there's someone with a problem on this forum it's possibly you Tan. It's a fact of life that whilst the vast majority will make a balanced decision based on available data and personal experience, there are those who may just allow 'other' factors to influence them into throwing caution to the wind and go. And yes, 99.99% of the time they'll get away with it. I understand what you are saying but you seem to be missing the point that perhaps not all are as disciplined in their decision making. The proof is in a fair number of accident reports!