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Sign Lighting Remnants
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A lot of old 60s era sign supports in Ontario still have remnants of their sign lighting equipment left behind. This one has part of the bracket for the fluorescent lights and the HO ballast box left on it along with a small segment of wire.
Note that the sign has been overlaid with aluminium panels. This was probably done in the mid 80s-90s when the sign lighting was removed so a more reflective sign was needed and the signs updated to include English/French directions. Overlaid signs are common on MTO freeways. The panels are usually riveted or screwed on the existing sign.
The sign is probably from the 1960-1970s though since it has rounded corners. Later signs had rounded borders on a square sign while the newest ones have square borders and square signs.
Note the Eagle Mark IV signal head too, it was salvaged and reused on this temporary set of signals.
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Here's another old style MTO support, which I call a rounded truss which I prefer to the newer ones. It was used from the mid 60s to the late 90s.
The next style was the rectangular truss style, which was used from the 1980s to the late 90s.
Starting in 1999 or so the triangle truss style was used. They also started to use the cantilvered style around this time too.
I believe only the rounded truss type and the 1980s sign supports has built in provisions for sign lighting.