I'm going to set my GPS to French
I omitted 'road' but what other sign would be sensible in this context?
Is this the same as a billboard? Does it mean a street sign or some other sign like "stop" or "yield?"
A billboard is « un panneau d'affichage », while « un panneau » includes all physical signs and panels, such as stop signs and yield signs, yes.
Merci pour vos deux explications
It didn't accept at first road sign, but there's no actual word meaning the in it.
Alex, the word 'the' is "hidden" in the word 'au'. In French, à + le (at the) becomes 'au'.
whats the difference between debut and premier?
(Le) début is strictly a noun meaning "start; beginning". It is not an adjective like premier.
Can anyone answer why it is spelt 'tournez'?
That is the formal imperative. You can instead say « tourne à gauche », but that is informal. If you don't wish to be rude to a stranger or person you need to show respect towards, use « tournez ».
signpost is common usage too!
"take a left turn" should be accepted, should it not?