These Rolling Barriers Could Decrease Crash Fatalities
02 July 2018
Every year, approximately 1.25 million people die as a result of a road traffic crash. To prevent vehicles from driving off the road, strong metal bars, commonly referred to as guardrails, run along a road's edge.
One Korean company, ETI Ltd., has developed a product to reduce the harsh impacts of guardrails, and save lives.
The impact energy of speeding vehicles is absorbed and converted to rotational energy which then propels the car forward instead of crashing.
Absorbing the collision shock in three points: The Barrel, The Buffering Bracket and the Liquidity of the Rails. It also guides cars in the moving direction to prevent secondary collisions.
The barriers are made from ethyl vinyl acetate (EVA), a shock-absorbing material. The barriers consists of a steel tube, between which plastic cylinders are fitted. These act as shock absorbers that spin around its axis, reducing the impact of a collision and ensuring the vehicle remains on the road instead of swerving off it
It has high-intensity reflective sheeting, that improves visibility for drivers at night. The bright yellow colour rollers deter people from speeding. Pieces can be replaced individually if damaged
It's height prevents cars from leaving the roadway
EVA has a better flexibility and elasticity compared to other polyethylene resins and has most similar features to rubber.
EVA has a better flexibility and elasticity compared to other polyethylene resins and has most similar features to rubber. In fact, it's lighter than rubber and more elastic than urethane. In short, it's not easily damaged.
When a car hits the guardrail, the rotating barrel converts shock from the vehicle to rotational energy. Upper and lower frames adjust tires of large and small vehicles to prevent the steering system from a functional loss.
Railway rails and liquid props absorb shock from accident vehicles, and frames with the smooth surface adjust tires of the vehicles and guide them in the moving direction to prevent second rear-end collisions. The three-dimensional structure of the D-shaped frame and buffering bracket distribute and absorb the second shock.
Props at an interval of 0.7 m increase bearing power to prevent vehicles from further derailing. As the props are independent, only damaged parts need to be replaced. This keeps maintenance costs pretty low.
Crash Test details:
The vehicle crash test was performed on three different vehicles and the rolling barrier satisfied all the criteria.
900 kg car, 20 0 side collision
During the evaluation, it was observed that the ETI product sends an accident vehicle back to the normal moving track, protects occupants and second vehicle accidents.
10-ton truck, 150 side collision
During the evaluation, it was observed that the ETI product changes the collision method to rotational friction to make collision continue for a long time and thus minimize momentary shock.
13-ton bus, 20 0 side collision
During the evaluation, it was observed that the ETI product changes the collision method to rotational friction to make collision continue for a long time and minimize momentary shock.
They're currently tested in many parts of Asia and will soon reach the US and Europe.
|Written by: Charlie Fischer|