Traffic cone
Traffic cones are usually used to divert traffic. The reflective sleeves are for nighttime visibility; the bosses at the top ease handling and can be used for attaching caution tape.
The traffic cone on the right is used in the United Kingdom to indicate that no parking is allowed.
Traffic cones, also called traffic pylons, road cones, highway cones, safety cones, witch's hat, or construction cones, are usually cone-shaped markers that are placed on roads or footpaths to temporarily redirect traffic in a safe manner. They are often used to create separation or merge lanes during road construction projects or automobile accidents, although heavier, more permanent markers or signs are used if the diversion is to stay in place for a long period of time.