Sorry, but simple physics and the manufacturers disagree. Your anecdotal evidence does not stack up against that.
http://www.csppacific.co.nz/Products...1&Categorized=
Those levels of deflection given on the table, which are typical, will ensure that installations immediately adjacent to opposing lanes will offer little beneficial protection. In the case of vehicles travelling in opposing directions at such close proximity the only acceptable solution is an inpenetrable barrier.
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