Our goal was to make it so there will be less wrecks at a stop sign. Our invention is going to change the world.We are making a stop sign that has led lights. The led lights are connected to a load cell and when a car hits the load cell from above the led lights will go on. Every year there are about seven hundred thousand wrecks at a stop sign. Our invention will lower that amount. We will have to put a pad over the load cell so we will not have to pave over it. Our invention will help police know who causes a wreck and who has to pay for the car damagePRESENT TECHNOLOGY The current technology of a stop sign is sheet aluminium with a plastic coat. Also, stop signs have metal with holes and paint that spells the word “STOP”. The holes in the metal are so that the metal doesn’t catch the wind and blow it over .The current stop sign isn’t that helpful because it doesn’t tell you when to go. The stop sign makes you wait for 3 other cars and then you go. We also need a load cell to tell the weight of the car.We are using a tension/compression load cell. They are better than any other load cell because a car weighs 4,000 pounds and every other type of load cell will break. Also, a tension compression load cell can go to a generator and turn on a light that lasts for 3 seconds . When a load is applied to the load cell the reaction in the load cell sends an electrical signal to a outlite or to our stop sign. A L.E.D. light can last for 50,000 hours. The lights are good for this invention because of the time that they can last. We thought about using neon lights but the gas might make the glass explode. L.E.D are bright enough to be seen in the day but not enough to blind someone. We also have a plastic cover for lights. L.E.D lights won’t melt the plastic because they are not like incandescent lights that have filament that burns the light bulb. HISTORY The stop sign has a lot of history. The first stop sign was made by a man named William Phelps Eno. He made it in Detroit, Michigan in 1915. The first stop sign colors were black letters and white in the background. It was originally square in shape. Several years later the sign was made with in the shape of an octagon. The 8 sides are unique to stop signs and alert drivers in both directions that there is a stop sign on the road. In present day it has changed very little. One difference that was good is that the letters are now white and the background is red. That way people can see it in the dark even without strong car lights. The load cell technology started way back with the Egyptians. The Egyptians created an equal arm balance to measure weight. Later this would evolve into a scale. This let the current load cell tell if there was a weight. The first related load cell was discovered by an English physicist called Sir Charles Wheatstone. He discovered a bridge circuit that could measure electrical charges. In 1938 the strain gauge was introduced to measure static and dynamic strains. With all of this technology it was possible to make the load cell. The only changes made to it up to 2017 was that there have been different load cells created. Some of them are the tension/compression , S-Beam load cells/, beam load cells, etc.. The first LED light bulb was created by Nick Holonyak, Jr. He created the first LED light, but it had to be red. It had to be red because the mixture that he made was red. M. George Craford created a brighter red LED light and the first yellow LED light. LED lights started to get more and more advanced over the years. It was first made in 1962.FUTURE TECHNOLOGYOur invention is a stop sign with LED lights and load cells. We call it “Stopped”. The stop sign that we invented is only going to be placed at four way stops. The stop sign is made so people will know when to go at a stop sign. It makes it so people won’t get in a wreck. Our invention tells people when to go by turning on LED lights that are green when it is a driver’s turn to go. The colors are different. The stop color will be red. The go the color will be green. It knows when a car is next to the sign because of the load cells under a pad. When people are at the four way stop they will go on a bigger pad. To make all the things run well we want to use an electric generator. We will have 4 load cells and then we will have 16 red LED lights on 1 stop sign and 16 lights that are green. We hope that there will be fewer wrecks at stop signs . BREAKTHROUGHS Along the way we ran into some trouble while doing our invention. For the LED lights we first tried to use neon lights. We thought that was a good idea but there was no green light. Then we were concerned about what would happen when it rains. Therefore, we decided to put a clear plastic covering over the LED lights so that they would be protected in the rain but still able to be seen. We thought about doing motion detectors but it would not connect to the LED lights. We thought of using an electrical signal to the LED lights but that may not work because it seemed to have technical difficulties. DESIGN PROCESS Our goal was to have an invention that reduced car accidents. So, our first thought was to use a pulley connected to a wall on the highway to pull cars out of traffic once they had an accident. We ditched this idea because it would take up too many lanes to pull the cars and all the traffic would stop. We also did not do it because we did not know how to connect the car to the hook and pull it without breaking anything. Then we thought of doing a board that goes out from the truck so that if the truck is carrying something really big it will be stable. We decided against this idea because we realized that even with the board things would still fall out and it wouldn’t work. Also, that it might not stay in place and carry something heavy. We also thought of a bunch of tire layers, so that when one popped there would still be a tire underneath that would work. Unfortunately, we thought that the tire would be too big to fit on and it might be hard to remove the tire once it popped. We also discovered that that technology already exists. Luckily, we thought of this “STOPPED” invention and no one else has thought of it.CONSEQUENCESOne of the bad things about our invention is that they would have to raise taxes to build Stopped. Another bad thing about our invention is that it would raise the electricity bill. If it malfunctioned, there is a risk of a crash. Another bad thing is that some people might not know what they are doing and go in front of it. If you installed this technology you would have to cut off the road for a long time and then it will cause a lot of traffic. The good thing about our invention is that there will be fewer wrecks. People won’t be stressing out when to start moving their car at a stop sign. Also, police officers will know who causes the wrecks. You will be able to stop take a deep breath while you are at the stop sign.