As to there being any quantity of snow fallen or likely to fall to impede their return, that was a mere joke; he was afraid they would find no difficulty.
The horror of being blocked up at Randalls, while her children were at Hartfield, was full in her imagination; and fancying the road to be now just passable for adventurous people, but in a state that admitted no delay, she was eager to have it settled, that her father and Emma should remain at Randalls, while she and her husband set forward instantly through all the possible accumulations of drifted snow that might impede them.
There are no more uses of "impede" in the book.
Show samples from other sources
She is impeding the progress of our project
But the hill was treacherously steep; he was impeded by the snow and his own lack of strength.