In a classic poverty-row noir, the protagonist struggles helplessly in the grip of inexorable fate. Currently rated 7.4 at the IMDB . This was the first poverty-row film chosen by the Library of Congress for its National Film Registry, in 1992. Don't miss it. The copy you find here is sharper than the two that have already been uploaded. And the mpeg2 file contains nav packets, so you can load it into DVDAuthorGUI (a free program) and quickly create a DVD to watch on your television.
You can stream Detour (1945) free and legally on OldReel, via the Internet Archive.
Yes — it is in the public domain and can be watched and shared freely.