"Cross rail tracks only when area beyond is clear" is what the sign says. After crossing this particular piece of rail, motorists have only a couple of metres before they encounter a traffic light.

Perhaps some unfortunate motorist once had to reverse faster than a pregnant woman at a chocolate exhibition after the vehicle in front came to a halt at the red light. Or, perhaps the city council was smart enough to realise that drivers are often much like sheep. Whichever it is, this sign certainly is large enough to catch anyone's attention.