This project is a solution that I came up with to solve the problem of subway cars getting overcrowded very quickly. I've come up with the idea to have sensors that track the capacity of the car by tracking the number of people going in and out.  The sensor would be able to count people going in and out from two different sides (preferably), and along with the sensors there would be an indicator to show how full the car is. There would be lights about the doors, red for full, yellow for half full (or starting to get full), and green indicating that more people can go into the car.

I came to the realization that this is a problem because when going on the subway it is so crowded that you're practically pressed up against someone, the feeling can almost be asphyxiating from being so close to everyone else. Another issue that the crowd causes, is that there is nowhere for people to hold onto for safety, because everyone has taken up all the spots.  So my idea will help fix that because each car will have a light showing the capacity of each car, and how full the car is.