Optical illusion. Probably the flash from the camera has 'flared out' the yellow colouring. I can say this without fear of being wrong! How does he know this 'for a fact', you may well ask? Because it runs on the surface along the 'median' for a distance of about 4 metres!!!...and you can trip over the entire length of it and take a dive into the oncoming traffic. The traffic here only has one speed and I don't mean that in a good way.
