[...]In the Locus UI, may I suggest: "Wet conditions". That means, in a general sense, things are wet right now. "Is wet" implies knowledge of the route, but you haven't been there specifically yet.
For the explanatory text, maybe "Avoid route that may be difficult in wet weather." (In North American English, the term "road" doesn't include trails, which are part of this.)[...]
"Wet conditions" seems good. "Iswet" followed the naming of my profile variable. There is useful to know there are 3 different contexts in BRouter profiles. Global context, way context and node context. Iswet is defined at global context, with no relation to any particular way or route.. There is another related variable ismuddy, at way context, with meaning the particular way has changed surface quality due wet conditions.
For the explanation, I would avoid the verb "to avoid", as the real meaning is just shifting of preferences. E.g.in an illustrative example of 2 alternatives, a primary road and a soil track: The soil track may be chosen in dry conditions if less than e.g. 1.5 times longer than the other one. At wet conditions, the threshold is moved to other value, e.g. 0.3 times longer.
Perhaps rather ways then route. Like "
Prefer ways not difficult at wet weather" Difficult may not be fully correct, if related to technical aspects involving skills. But I agree it is hard to choose single verb describing all aspects.
