I had my wife go maybe 200 ft and she said it was visible during the day. This was after redoing the taillight one time. The first time I used 3 coats of tint and my wife was quick to tell me it was too dark. The second time I only put down 2 coats. It was much brighter the second time around. Believe me she would be the first to tell me if it was not visible. I certainly dont want to be rear ended due to them being not visible enough - that only puts me and the other driver at risk. As you can see I had "smoked" tails and I have never had any issues with them. However, the real test will be having a few cops behind me and seeing how they feel about.