Just in case it wasn’t obvious that there’s some roadwork going on, here’s some overkill.
This cluster of road signs is right here in Saint Jean de Sixt. It starts with a roadworks sign, then a ‘circulation alternée‘ (changed traffic circulation) sign, followed by a sign to give way according to the traffic lights ahead, then a no overtaking sign, then a speed limit of 50 (which is the impossible speed limit on this windy back road anyway).
And if all those signs don’t take your concentration away from the road long enough to cause an accident, that A4 piece of paper might.
The traffic lights are typical of French roadwork. Oddly, the green light is never activated. You stop on red and you go when the orange starts flashing. This rightly confuses foreign tourists, who, waiting for a green light, don’t know whether to go or not until impatient locals overtake them. It’s not really a problem because anyone left in the queue when the light turns red again simply drives on regardless. The queue stops again when the next confused tourist pulls up.
The locals have it right: ignore all the road signs to improve road safety!