Hello? I can't see you!

It's strange to see that people in a moving car waving frantically to passerby but they do not get any respond. It makes them look like a clown in car. I had experienced it before too, trying to catch my friends' attention when I drove by but failed. No, I did not go at speed of 60km/h. I was just driving in my company's compound going out through the main gate. All the doubts were cleared one sunny day. While I was on my way to take my car, a few cars drove by. Being a usual me, I didn't pay any attention to them. Suddenly I see a girl waving like mad in one of the car. I couldn't see clearly who she was. I wasn't even sure if she's a he or a she if not for the blur image of a ponytail. Was my eyes that bad? Apparently, it was not my eyes but the problem lies with the tinted window. The reflection was quite good, you can even use them as mirror. Now I know how I looked like when I try to wave goodbye to people outside there.