The current technology of a stop signs is sheet aluminium with a plastic coat. Also, the stop signs have metal with holes and paint that spells the word “STOP”. The holes in the metal is so that the metal doesn’t catch the wind and blow it over .The current stop sign. isn’t that helpful because the current stop sign doesn’t tell you when to go. The stop sign make 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 thing will break. Also it can go to a generator and it can turn on a light and the light is on for 5 seconds .  When a load is applied to the load cell the reaction in the load cell sends a electrical signal to a outlite or 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 doing 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 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. The stop sign was made in 1915. The color was first with black letters and white as the background. They made it 8 sides so when a driver comes at night on the other side they will now see oncoming drivers are coming at a stop sign.Now in present day it changed very little but i think that is good because the person that made it did a really good job.  The only way it changed is by changing the letters white and the back round red so people can see it in the dark without any 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 to tell if there is 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  ect…            The first LED light bulb was created by Nick Holonyak Jr.  He  created a the first L.E.D light but it had to be red. It had to be red because of the mixture that he made was red. M. George Craford created a brighter red L.E.D light and the first yellow L.E.D light. L.E.D lights started to get more and more advanced over the years.FUTURE TECHNOLOGYOur invention is a stop sign with L.E.D 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. It tells people when to go by turning on L.E.D lights that are green  when it is your 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 we want to use a 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 less wrecks at stop signs hopefully .                                          BREAKTHROUGHS    Along the way we ran into some trouble while doing our invention.  For the L.E.D. lights we tried to use neon lights. We thought that was a good idea but there was no green light.Then we thought about  what happens when it rains.Then we said we will put a clear plastic covering over the led lights so you can still see them. Also we thought of security cameras but it would take up to much storage.We thought of doing motion detectors but it would not connect to the  L.E.D lights