No, I think the 85th percentile science is valid, but the formula is flawed as it does not take into account extrinsic factors. It just encourages a blanket use, rather than further analysis. However, having read those links, it seems in practice people aren't so dumb as to just do some calculations and whack on a speed limit.
I think the city has really fucked up here, and the solution is to either hire some crafty lawyers to draft a more appropriate ordnance, or give up. City ordnances cannot explicitly contradict acts of the legislative body that created the city itself (and gave them the power). I'd say give up.
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One stumble does not constitute total failure;
One victory does not constitute total success.
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