It's established to prevent passersby from inadvertently entering into the incident zone.Īny time that roadside personnel need to divide vehicular lanes to accommodate a different traffic flow, they'll use traffic cones to mark these special lanes. Let's review each category in greater detail.Ī work zone is any highway area where there are construction, maintenance or utility activities taking place.Īn incident zone is an area marked off by authorized personnel immediately after a traffic incident has occurred. The four main TTC Zone categories include: This term is used to define any roadside area where normal conditions are changed. Traffic cones are used to designate what's known as Temporary Traffic Control Zones, or TTC Zones. These cones are appropriate for roadways with posted speed limits of 45 miles per hour or greater. 36 Inch conesĬertain states, including Delaware and Florida, require traffic cones to be at least 36 inches tall. They are most commonly used as hazard markers, though they're also helpful as blockades. 28 Inch conesĪny traffic cone that is 28 inches high must include a heavy base that is at least 10 pounds. They are most commonly used for parking lots, athletic events, and landscaping purposes. You can use 18-inch traffic cones for roadways that have posted speed limits of under 45 miles per hour. These are reserved for athletic events or to design courses for pet-related training. You cannot legally use 12-inch traffic cones on public roads. These are reserved for driver's education courses and to designate indoor hazards. You cannot legally use six-inch traffic cones on public roads. Let's explore the most common cone sizes. There are different heights and size categories used for different scenarios. Where Are Different Traffic Cone Sizes Used? In addition, the Federal Highway Administration (FHA) requires that traffic cones meet certain specifications for: To be considered legal for road use, these cones must be constructed and molded from shock-absorbing plastic that's safer for cars than the materials used to build harder all-purpose cones. According to the Manual for Uniform Traffic Control Devices, this means that they are specially designed to serve as a temporary guide for motorists traveling on public roads. In short, these are protective safety tools that are designed as channeling devices. Let's begin with a simple question: What are traffic cones in the first place? Today, we're exploring the significance behind those neon cones, including what they mean, what they're used for and why they're some of the most critical pieces of safety gear around. Yet, there is more to this safety equipment than meets the eye. You've driven past them countless times, likely not thinking too much about their placement or importance. There's no doubt you've seen them on the roadside: those bright traffic cones that direct you where to go during highway construction.
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