Changes

Make a sign of a large sheet of brightly colored paper glued to a sheet of cardboard. Cover this with self adhesive transparent book wrap. Now you have a re-usable sign which you can use with a whiteboard marker and clean again with a small towel.

If you have a chance to plan a long hitchhiking trip in advance, some find using an erasable white board as a sign to be very useful for making big, clear and reusable signs. This sign can be used a lot of times without being cleaned with alcohol, and is resistant to wind and water.

Another possibility is to make a sign out of two small white boards that children use at school. Just join them with enough string so that you can fold those boards like you would close a book. The benefits compared to a single white board are that this sign takes a smaller place when folded (so it fits better in your bag), and that you can write your destination in advance without it rubs out in your bag.

====Reusable sign combined with map====