Totally my fault!!! coming into the harbour tunnel today at 4.00pm, northbound, there was traffic everywhere but all moving along nicely at 80 km/h and easy.........................no stupid movements, no one acting silly etc etc. I followed a black 4wd into the tunnel and before I went into the tunnel, I could see clearly a few car lengths in front. If you know the tunnel's northbound entrance (and this is where it is my fault) you sort of drop into the tunnel a little blind. Now if you follow traffic in Sydney the required braking distance away, everyone just jumps in front of you, so I always look beyond the car in front as well as everywhere else, but I NEVER ride up the backside of the cars in front. So, at this moment the traffic comes to almost a dead stop in front of this 4wd so I grab as much brake as I can (I am on my TTR250 BTW) and I have locked up the rear wheel and am squeezing and releasing the front (to avoid a front lock up) and I am doing little fishtails while I am looking for the escape (car and wall beside me......no where to go). Isn't it funny how it all goes into slow motion??? I come to a stop about 1m from the rear bumper and I am watching my mirrors at the car behind, who was alert and have braked(?) well. My sphincter was in a knot by this time and you can imagine how I felt when I heard the noisiest screeching of brakes behind the car behind me..................................brown undies time!!!! Head check, no indicator and into a space in the left lane beside me and ride off a little ardenalized. The cars all started moving off and the car(s) that were behind stayed back a long way for the rest of the tunnel. I am glad that my emergency braking was effective.....................annoyed with myself that I had no escape route and also the fact I did not foresee this road condition. Just a heads up!! Everyday is a school day You brown spot moment??????