>>Driving on the rural highways in Ontario, at night, in the rain can be a nightmare: They have a camber: they're light grey in colour such that the faded central white lines can't be seen under the surface wet; they're full of winter pot-holes; the rain puts an overall sheen over the surface such that you get the visual effect of driving on crumpled cellophane; it's hard to discern where the road ends and the shoulder begins; dazzle from oncoming headlights.
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>>If ever there was a candidate for central line cat's eyes, this is it.
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>I've been saying that for years. You're absolutely right. When it rains at night, it's impossible to see where the road is. You generally end up following somebody else's tail lights and hoping he/she knows the way. The worst is being the first in line and everyone is following you and you have no idea where the road is.

Yeah! :-) I've been there!
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>I can't understand why, whenever they repair roads, they don't just install cat's eyes as a matter of course.

Maybe the winter subsidence would just swallow them, or the undulations would mean they're no longer at the correct angle to reflect. Anyway, I've never seen ANY cats' eyes in Canada.