The reflectance sensors are extremely important because they allow us to follow through with our MCR. Reflectance sensors work with the help of a single infrared LED and a small photoresistor. For our project specifically, the reflectance sensors help with AEV localization. It localizes our AEV by recording marks every time a non-reflective surface passes over a sensor. On our AEV, reflective tape can be found in one of the wheels, this allows us to treat each mark that the sensor perceives as a distance of 0.4875 inches because the diameter of our wheels is known.