What do the experts think?
...And graphic designer Chris Watterston said a symbol should always be as realistic as possible.
"It still needs to be simple enough for the human brain to process the symbol in as minimal time as possible [because] not doing so would almost certainly cause confusion and frustration. "You've got to bear in mind that road signs are only ever going to be viewed by a driver for just a few seconds each time, meaning that recognition is key."