These safety cones are a ‘must have’ for construction and repairs around highways, roadsides, streets, anywhere that may cause a hazard to the public. The U.S. Department of Transportation (DOT) and the Federal Highway Division requires that cones used at night on state highways and interstates have reflective material (MUTCD Standard 6-3). (MUTCD is the ‘Manual on Uniform Traffic Control Devices’). These reflective cones meet Federal requirements for night visibility, as the collars are made from 3MTM high intensity, reflective material. Also mandatory (MUTCD section 3F.02) states that “cones used on State and Federal Highways must be orange in color and at least 28” tall.” Channeling devices (traffic cones) used “outside of traffic control zones must be a minimum of 18” in height.” For nighttime use, channeling devices must be retroreflective, (meaning the reflection is sent back to the light source… like a cat’s eye, not wasted by going in all directions.), and the retroreflection of cones shall be provided by a minimum of 6” white bands placed a minimum of 3” from the top. The 18” has the required 6” stripe and weighs 3 lbs. They are made of heavy duty, flexible polyvinyl chloride and will withstand the abuse if run over.