The Overview: What are the ingredients of a good hitchhiking sign: clearly written, the correct destination, a boarder around the perimeter.
You're driving down the road and, as you pass him, you notice a hitchhiker in time to think, "wonder where he's going," before he passes out of sight. B) Hey, there's a guy on the side of the road going to Twin Falls, christ, I'm going to Twin Falls too - I'll take him with. (!)
Hitchhiking signs show people: where you're going, you're literate (i.e. you are able to read and write), you are on a planned trip. I suggest you have a sign every time you hitchhike.
Look at your map and try to guess where the cars, which are passing you, are headed. Ask yourself:
If you answer, "I don't know," you may have a shitty map or,
you fucking idiot you forgot your fucking map no map at all in which case, shame on you and you should read my popular map page again.
Making the Sign
You had your map. Now you have your destination. You're ready to make your sign.
The Resolve: A readable sign with border and with a correct destination will get you a where you're going.
Afterthought: If you're standing on a busy roadway for a long long time, 2 hours or more, and no people are smiling at you and no one's stopped or pointed - if people aren't noticing you You're on the wrong road, or the wrong side of the road.