Cul-de-sac
A
cul-de-sac is, in English, a street or
road with only one entrance.
While some are true cul-de-sacs, with no passage possible, others allow cyclists, pedestrians etc. to pass.
When progressing along a road, if there is a point at which there is no way out except the way one came in, then at the point, one is facing into a cul-de-sac.