Traffic cone

The traffic cone is a cone-shaped item placed on roads to restrict vehicle access.

Halo 2
In Halo 2 the traffic cones were a triangle with an exclamation point on them. There was a Scarab Gun in Halo 2 that floated over a traffic cone on a ridiculously high bridge

Halo 3
In Halo 3 it is on many human-based maps, such as The Pit and Foundry (Heroic Map pack). These cones are usually found around fusion coils. If the fusion coils are shot, or a grenade is thrown at them, or they are stuck with a plasma grenade/spike grenade, the traffic cone will shoot across the map at great speed. It is possible to be splattered by a traffic cone. They also appear several times in campaign.

Trivia

 * The first person to get killed by a traffic cone in Halo 3 got the Recon Armor. (Please note that Bungie employees do not appreciate getting constant emails about being cone-splattered.)
 * If you get a splatter kill with a Hornet and look on Bungie.net, it says you were killed by a traffic cone
 * If you get a splatter kill with an Elephant and look on Bungie.net, it will say you were killed by a traffic cone.
 * If you get a kill/killed by a traffic cone, on your Bungie.net profile it will say under classified: "I'm calling my lawyer!"
 * You can see the first traffic cone splatter at this link

List of appearances

 * Halo 2
 * Halo 3
 * Halo: Reach
 * Halo 4
 * Halo 2: Anniversary
 * Halo 5: Guardians