The main villains on these roads are usually the yellow minibuses, known as danfos, which can switch lanes in a split-second, sending nearby vehicles screeching to avoid them.

BBC: Beijing traffic jam

Looking at the ease with which we now capture colour pictures and transmit them around the world in seconds it's easy to forget that it was not that long ago news agencies were transmitting their wire photographs as colour separations, usually cyan, magenta and yellow - a process that relied on Clerk Maxwell's discovery.

BBC: Pioneering colour photography

The image, replacing profile pictures on Facebook, Twitter, Instagram, Tumblr, Pinterest and elsewhere, is a makeover of the advocacy group's logo, usually a blue background with bright yellow lines.

NPR: Gay Marriage Equality Box Spreads On Social Media

The decision has ramifications beyond striking down a plan to put street-hail cars in boroughs outside Manhattan's central business district, where people looking for a ride usually must call a livery cab to pick them up or hope that a yellow taxi passes by.

WSJ: Court Nixes Taxi Plan

Rep. MATHESON: Well, there are various stories about that, and it was a little before my time, but the story that I usually tell is that, you know, we had a term for a long time in politics called the Yellow Dog Democrat, which is that people would say I'll vote for a Democrat even if it's a yellow dog.

NPR: Blue Dogs Democrats Have a Centrist Agenda