The Yellow Handkerchief

Shiawase no kiiroi hankachi is a movie starring Ken Takakura, Chieko Baishô, and Kaori Momoi. Three complete strangers embark on a road-trip to Hokkaido.
The story is about a convict released from prison for an old murder who is thinking about returning to his ex-wife and his former life. If she puts a yellow handkerchief on the window, it would mean that she wants him back at home.