The Grenade Tripwire is used to provide area denial by preventing others from traversing an area of land. The Can, Flare and Smoke Tripwires can be used as an alarm system to alert the player to the presence of other players.
It is currently unknown if the Tripwire can be activated by animals, but it can likely be activated by zombies, as does the Bear Trap.
There are four variants of the Tripwire - Can, Flare, Grenade and Smoke. All require String and a Wood Pile as an ingredient.