[Tagging] How to tag a "overhead electronic display" ?

[Andrew MacKinnon]

In Toronto there are overhead signs that say something like "EXPRESS
AND COLLECTOR MOVING VERY SLOWLY BEYOND NEXT TRANSFER" (on Highway
401). Sometimes these signs will have safety messages like "DO NOT
DRINK AND DRIVE" or will show the name of the next few exits, or will
display that there is an accident ahead. Then there are other signs
(usually in the middle of the highway on the provincial highways) that
are like "TO 400 30 MIN TO 427 45 MIN". There are no variable speed
limits in Toronto. The official speed limit on most highways in the
GTA is 100 km/h (90km/h on DVP and part of Gardiner, 80km/h on Allen)
but if the traffic is good this is widely ignored.

See example http://www.mapillary.com/map/im/wsXILLzjVIlOnxrOhQliRw/photo
(on northbound 427 near Burnhamthorpe, "16 MINS TO HWY 400 VIA
427/401")
http://www.mapillary.com/map/im/zrfQjf2e2A5N-bcmLJyykQ/photo (on
eastbound 401 east of Bayview, "EXPRESS AND COLLECTOR MOVING WELL
BEYOND NEXT TRANSFER")