Final Scene (**spoilers**)
In the final scene, Joe is lying dead and Diane is seen walking off by herself down the dry river bed. This seems to indicate that she is now alone, but also that she is getting off scot free as the cops let her go.
But, she was definitely an accomplice when she got the money and brought it to Joe. Diane should have done hard time for that. But, at the end, Diane seems to be off the hook with the law, except that she is now completely alone.
I did think that Diane's character change from a money grabbing broad to the girl next door, only concerned about her guy, really detracted from the character and limited Joan Dixon's ability to keep the character interesting for the entire movie.
Roadblock really is an excellent film, and it kept me interested all the way.