The traffic signs are well placed on important locations. Do take a moment and check them out.
They wouldn't bother putting them up there if there was no need for them, right?
You are in amazing yet dangerously rough terrain.
Have a map of the area with you, and check regularly if you are on the right route.
Maps are available free of charge everywhere, there will probably be a pile waiting for you at the entrance lobby of your hotel or apartment house.
There are signs, but if you miss to notice or ignore them they don't really help.
ENLARGE THAT PICTURE, PLEASE
Since the weather can be rather unpredictable up here, try to be informed about the forecast. In case of bad weather, which may occur out of nowhere in minutes, ski lifts and gondolas have to stop, and you may find yourself far away from your final destination, with only option to use a taxi service.
Tourist office in Val Gardena has the latest weather forecast on their Info panel, they are always willing to help with advice, and there is a free internet access for max 15 minutes.
Also in case of bad forecast and danger of avalanches, there are warnings near entrances to gondolas and ski lifts, and some even have electronic displays flashing messages in different languages.
So you can’t say you haven’t been warned.