How many tail lights are required for vehicles in Illinois?

In Illinois, vehicles are required to have two red tail lights, with one on each side of the vehicle. This requirement is in place to enhance visibility and safety on the road. The presence of two tail lights ensures that the vehicle is clearly seen from behind, especially at night or in low-light conditions, which is crucial for preventing accidents.

Having just one tail light would not meet state regulations, as it would significantly reduce the visibility of the vehicle to other drivers. Additionally, the requirement for two lights accounts for potential issues such as one light failing; the other would still be operational to maintain visibility. Therefore, the correct choice reflects the legal standard intended to promote safety for all road users.