Traffic cones are typically used outdoors during road work or other situations requiring traffic redirection or advance warning of hazards or dangers, or the prevention of traffic. For night time use, traffic cones are usually fitted with a retroreflective sleeve to increase visibility.
In the US, cones are required by the US Federal Highway Administration’s Manual on Uniform Traffic Control Devices (MUTCD) to be fitted with reflective white bands to increase night-time visibility.
Various sizes are used, commonly ranging from around 30 cm (11.8") to a little over 1 m (39.4"). Traffic cones come in many different colors, with orange being the most common color.
Delineators are particularly beneficial at locations where the alignment might be confusing or unexpected, such as at lane-reduction transitions and curves.
Delineators are effective guidance devices at night and during adverse weather. An important advantage of delineators in certain locations is that they remain visible when the roadway is wet or snow-covered. Delineators are considered guidance devices rather than warning devices.
Traffic Barricades are used to block excavations or road construction or for other safety-related purposes. Made of wood, or wood and steel, or plastic, or composite materials.
The A-frame barricade resembles a sawhorse with a brightly painted top rail.
Type I (or II) barricades, also known as a waffle-board barricades, resemble a sawhorse that can be folded flat. Type I indicates sheeting on top; Type II has sheeting on top and bottom.
Type III barricades have multiple rails supported by two end posts.
Type I, II and III barricades are commonly used for road detours and closings where vehicles are present. A-Frame barricades are more typically seen where pedestrian traffic control is needed or on low speed roads.
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