Here in New York I see some have been converted. I have also seen a few incandescent reds that have been fitted with a strobe tube across it's face. These flash when the red is on. They do this at locations of poor visibility.
On the subject of LED's, Many high end cars are now using them for brake lights. I first started noticing them on some trucks like UPS and FEDEX.
You can always spot these by their instant on/off operation which is quite different than the familiar incandescent.
-Hal
