Encountered my first one yesterday! I can now really tell why they take out so many bikers. I was going around the large roundabout at Aldgate in London, on wet roads - suddenly it felt like I was riding over ice with my front wheel - very scary and very dangerous - I then noticed the huge patch of rainbow coloured diesel all over an entire lane. Thankfully I only touched a small part of the spill and did not ride right into it.
This should be a criminal offence to allow your vehicle to spill diesel over the roads. :evil: :evil: