I THINK you have to PAINT a car on the cardboard. I saw that on some web page they were testing many makes of cars to see which worked best. Cardboard but had a car back side with taillights painted on cardboard. Then they ran at it and had cones setup to see if it did crash into it how far it would go past cardboard picture. They increased the speed faster and faster. I think the Subaru model won the test beating a Tesla. As the car went faster and faster they all eventually failed. I think 30 mph was the best the one could do. it would be an interesting test,. Who has some large cardboard?? lolWhat you can do is put a big piece of tall cardboard on the street and drive towards it. It should stop that’s what I did to see if mine worked
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