Wasn't sure whether to put this here or in near misses, mods feel free to move if necessary. Had a very scary moment today riding to work. We had a lot of rain on Mon/Tue, I always ride the same route (approx 150 times in the 7 months I've been riding), and the particular corner I encountered a problem with today was clear yesterday of debris after the rain. We had a very windy day yesterday, and this must have blown dirt/gravel on to the road, and this I wasn't expecting after it being clear after the rain. Despite having done an advanced riding course 2 weeks ago (highly recommended), I did exactly the opposite of what I knew I should do. This corner is a 90 degree left hand turn which I normally take between 50-60kph and it's very safe and within my limits at that speed - that is unless you encounter gravel as I did. The road in this spot is sort of light brown rather than regular black tar (end of a concrete bridge) and this helped hide the brown dirt/gravel until it was too late to avoid it. So what did I do? Instead of continuing to look through the corner and maintain the throttle, I looked at the spot and lifted off the throttle. The front end skipped/slid, I thought "oh shit", and it took me wide on the corner so I went over the centre line slightly onto the other side of the road - luckily no traffic coming the other way and very lucky also not to low-slide. I believe I was following the correct line through the corner as taught on the advanced course. However the gravel was in the centre of the lane between the tyre tracks. I hit it in the spot where you cross from wide entry to tight finish. Things to learn from this: 1. Expect the unexpected! 2. Not sure how you do this - but I have fight my natural instinct to slow/ease off in this situation and continue through the corner maintaining throttle. 3. Slow down. Even though this corner is 100% safe at that speed in perfect conditions - it wasn't perfect conditions today and I nearly come unstuck because of that. If I had being going say 20 kph slower I would have had more time to see/attempt to avoid the gravel. I'm sure there is other things to be learnt from this also so feel free to chip in. Hopefully this can help some other new riders.