Fallout 4 traps

Traps in Fallout 4 can be found all over the The Commonwealth.

Natural Traps
Traps formed naturally from both flora and fauna, generally emitting radioactive clouds.

Barnacle
The barnacle, a crustacean, is an unusually large barnacle found in coastal regions generally clinging to rocks and other vertical surfaces next to the sea.

For example at Neponset Park, Nahant Oceanological Society and an unmarked location NW of Breakheart Banks. Upon approaching it, the barnacle releases a radioactive cloud that irradiates the Sole Survivor at a rate of +30 rads/s for a few seconds.

Irradiated Thistle
A spiky leafed, purple coloured plant growing in open grassland and around shrubs. Typically it will release a visible, green tinged radioactive cloud producing 30 Rads/s when the player character moves close to the plant. They tend to grow in groups which can increase the potential dosage.

A group of two specimens can be seen growing next to the wooden electricity pole just west of the Red Rocket truck stop near Sanctuary. A larger group of five-six grow a little way north of USAF Satellite Station Olivia in a dry clay patch by a wooden basket.

Makeshift bomb
The makeshift bomb can be found in various places such as Hugo's Hole and has the appearance of a cigar box with a small circuit board with some diodes in it and duct tape holding it to a wall. Upon disarming a makeshift bomb, the player receives a Spring, Steel & Copper.

Jury rigged guns
There are numerous types of guns jury rigged to fire at an entrance way when triggered. These include double-barrel shotguns, pipe pistols, laser rifles and missile launchers.

Gas trap
Rooms which are filled with a flammable gas, causing a wavy effect in the air. Firing a weapon inside the gas cloud ignites it. One can be found in the diner in Easy City Downs. Another can be found in a shed at Saugus Ironworks.

Gasoline trap
Rainbow colored discoloration on the ground indicates gasoline. Firing a weapon at the fuel ignites it.

Flamethrower trap
A flamethrower jury rigged to shoot fire at the player. Typically activated by opening the door they are found behind.

Grenade bouquet
The grenade bouquet is one to three frag grenades being held by a small wire or string that, upon triggering, pulls the pin and drops them to the ground. Upon disarming a bouquet the player receives a number of grenades corresponding to how many were in the bouquet.

Weak Plank
Typically one or two wooden planks forming part of a makeshift bridge will give way as the player character moves over them, potentially causing them to fall and possibly take fall damage.

An example of this type of trap can be found on the south elevation of Saugus Ironworks where a small plank bridge joins two sections of steel stairway. The outer two planks will creak then break away when walking or running across.

Spotlights
Spotlights are lights which scan across an area and can detect intruders, alerting nearby enemies by beeping loudly. They will continue to follow intruders with their light as long as they are in the light's line of sight.

Clapping cymbal monkey
These monkey dolls will raise their head to look at nearby intruders with green eyes. Should the intruder remain in their line of sight too long, their eyes will begin flashing red and they will begin clapping their cymbals together. This will alert nearby enemies to the intruder.

Tin can chimes
A string of tin cans suspended from a doorway or ceiling. They will chime upon contact and alert nearby enemies to one's presence if the Sole Survivor or a companion runs into them. Collecting them will also cause the chimes to sound.

Handmade trip wire
The handmade trip wire appears to be a green thread or fishing line that's put across walkways to make a trap go off. Upon disarming the tripe wires the Sole Survivor is awarded a gear and a spring
 * Three can be found in Hugo's Hole

Laser tripwire
The laser tripwire is a fairly obvious tripwire as it emits multiple red lights that are easily seen.
 * Two can be found in the Taffington boathouse
 * 49 can be found in the basement of the town hall in Jamaica Plain.
 * Upon disarming a Laser tripwire you get a Fiber optics and a Crystal

Tension trigger
The tension trigger appears to be a small box with short range radio capabilities as it has antennae and no physical connection with what they activate.
 * One can be found in Revere Beach station
 * Upon disarming the Sole Survivor is awarded a Spring and a Gear

Bathroom scale
The bathroom scale appears to be a normal bathroom scale with the word "Dead" written on the numbers.
 * Found in multiple locations, such as Poseiden Reservior and Dunwich Borers.
 * Upon disarming the scale the Sole Survivor is awarded a Copper,Spring & Steel.
 * A huge number of these can be found in the maze near Milton General Hospital.