Fallout 4 traps

Traps in Fallout 4 can be found all over the Commonwealth, the Island, and Nuka-World.

Environmental traps
Environmental traps represent those the player character as part of the environment, this includes both naturally occurring and man-made hazards. They universally cannot be disarmed as a group.

Manmade traps
Manmade traps are those which required Human involvement to construct more deadly than environmental traps due to their increased lethality. Often found in conjunction with firing mechanisms to trigger them.

Noise making traps
Noise making traps are focused on alerting enemies to one's position, often found surrounding occupied areas.

Caltrops
A craftable version of caltrops that can be used to cause staggering and minor damage. Due to movement when the map respawns, they can result in NPC's becoming hostile.

Poisoned caltrops
Poisoned version of the caltrops.

Trap door
Trap doors are large, flat wooden floor sections with a small trapdoor in the center, about the size of a regular small floor section. When an NPC or something heavy is placed on top of the trap door, it automatically opens up, causing them to fall through the hole, after which the trap door closes itself.

It requires no power source and does not directly harm NPCs (though they can suffer fall damage or be hurt by any other traps placed below). The platform snaps to floors and foundations. Due to the small size of the trap door, humanoid NPCs can have difficulty successfully falling down the hole.

Spring trap
A trap consisting of a pressure plate connected to a spring-loaded sheet of jagged, rusty metal, serving as a blade. When the pressure plate is stepped on by an NPC, the blade jumps forward, stabbing whoever activates it before resetting itself back into place. It requires no power.

Powered spring trap
Same as the spring trap, but it requires a power source of any amount. Provides +1 defense for settlements. It can only be activated by connecting it to a switch of any kind, such as a laser tripwire. After activating, it must be manually reset via the connected switch.

Sawblade trap
The sawblade trap consists of six circular sawblades stacked on a seven-foot-tall metal pole, held upright and running along a set of rails on the ground. When connected to a power source, the pole rapidly spins around and slowly runs back and forth along the rail, slicing up anyone who gets too close. Like the powered spring trap, it only requires a direct connection to power. The rail itself is about one and a half floor squares long and requires a wider breadth to move.

Spike trap
The spike trap resembles a concrete floor foundation with a large pressure-sensitive platform covering most of its area. When stepped on, large spikes (made from sharpened steel girders) shoot up from holes in the platform, stabbing any NPCs that walk on it. It resets when weight is removed. The spike trap snaps to floors and foundations.