I can give you a personal example of why even if the barriers were raised to five feet it may not be enough.
Last summer, I was heading eastbound Glenmore, just before Deerfoot.
Was in the left most lane when I saw, and was mesmerized by, a car flying over the meridian at me.
Luckily for me, it wrapped itself around a pillar just before I passed by.
At point of impact, the lowest part of that vehicle was at least three feet over the barrier.
There was no snow, or ice... the roads were bare and dry.
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