Out here in Winnipeg MB it seems that they are being replaced as they burn out or if the signal pole gets hit the whole head gets replaced with LED. And of course new signal constructon gets the LED head as well.
The City of Winnipeg signals department also says that they can save money on pedestrian crossing heads by removing one of the two bulb ones on each pole and putting a single LED walk don't walk matrix head in. They try to do this when they have to relamp a head. From what I read in the newspaper the signals deptartment figures by doing this they won't have to buy new heads for about 8 or 9 years.
It looks a little funny as on one side of the street there is the normal two head pedestrian signal and the other side has the single walk don't walk head.
