Indeed, the height is not arbitrary...
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It is designed to minimize vehicle damage in cases of incidental contact while still preventing the crossover case of a head-on collision...
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The 42-inch-high Ontario Tall Wall barrier is a taller version of the Jersey. It was developed by the Department of Highways in its namesake Canadian province after it conducted crash tests of the Jersey in 1968, and it was ahead of its time. The growth in vehicle size over the past decade has forced most state highway departments to rethink the height of their barriers, as the 32-inch-high design has proved somewhat vulnerable to sport-utility vehicles and oversize trucks on today’s highways. While the 32-inch barrier remains the Federal Highway Administration minimum standard, New York, Massachusetts, and even New Jersey have adopted the 42-inch...
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The new barriers along Stoney Trail SE are not traditionally shaped Jersey barriers but
constant slope barriers which are less susceptible to this problem. Look at Deerfoot between 22X and Cranston Ave/Seton Blvd, or the new barriers in the median of Airport Trail.