For whatever reason that I've long since forgot, I've always prayed for the intercession of St. Joseph for safe travel and for "the grace of working" as the Rule puts it. I don't know if I got this prayer from somewhere or if I made it up or if it's a little of both. I say it whenever I go somewhere, adding the part in brackets if I'm going to work:
St. Joseph, by your diligent care you safely brought the Holy Family back and forth to Egypt and saved the child Jesus from the danger which threatened his life. By your prayers to God today, bring me safely on this journey. [And pray for me, St. Joseph, that I may work honestly and diligently, in imitation of you.] Pray for me St. Joseph, my patron, for safe travel [and for honest work] in the name of Jesus Christ the Lord. Amen.