A side window that is behind the vehicle operator must have a light transmission of?

A side window that is behind the vehicle operator must have a light transmission of 25%. This regulation is in place to ensure that while a certain level of tinting can be applied for privacy and aesthetic reasons, it doesn't compromise the visibility needed for safe driving. The law requires this level of light transmission to balance passenger comfort with the driver's ability to see and be seen, promoting safety on the road. Higher percentages mean more light can pass through, enhancing visibility, which is particularly important to avoid accidents and maintain a clear line of sight.