There are many circumstances where a trip wire trap is preferable to those that use bait. A trip wire is often more effective on known game trails or gaps in the terrain that are difficult to navigate around. In a survival situation it could also be likely that you have nothing that could be used as bait, or what you do have available is better used to feed yourself. Here is an example of a simple trip wire design:
This particular trap is effective against small game such as raccoons. Rather than using a rock as a counterweight, a bent tree can be used to tighten the noose. Using a tree will use less rope than a counterweight, which is important to conserve resources. Traps should be checked from a distance once every two hours when in a survival situation. It is important to stay quiet when checking traps so that any animals near by are not scared out of the area. It is also important to set as many traps as possible, and for a variety of animals. For example, it would be wise to set two or three of these in light woods, and on trails in thick brush set half a dozen wire snares for rabbits. Doing so will give a better chance of having a trap in an area with active game.