To ensure safety before taking a long trip, get out a map of the area through which you are going to be traveling.
Cast a circle and then useing a green pent, trace the route you are going to take. After you have done so, take a peice of white chalk and lightly color over the entier itinerary with a thin layer, visualizing the white chalk as a glowing light of protection along the route.
Then place a row of amethsyt, or tiger's-eye, or a string of beads, along the route and say "Guard and guide our trip and all who venture on this road. See us safely to our destination, see us safely home. Blessed be.
Visualize yourself arriving safely. Fold the map with the crystals inside and tie it with a white ribbon. Keep it on your altar or in a safe place untill you return.