Yeah the hope is that lowering the speed limit will prevent said car from rolling 5 times after the impact. At the end of the day, no road is crash proof when we give out driver's licenses like candy. Deerfoot is a disaster mostly done in the 70s and 80s but mainline Stoney and Henday are built to the highest standards we have and still have had perhaps more fatal crashes than one would expect, including Stoney SE which is just 8 lanes of straight freeway and perfect sightlines, except the giant radius curve down at Mahogany.
Alberta Transportation has to do a balancing act to keep dumb people alive, but also to not make people have to drive around the city to make a turn... and in the end no one is happy.
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