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> The problem is, one day you make it easy for people to think it's ok to do 30 in a 25, then the next day they're doing 35, then 45 the next.

That sounds like the classic "slippery slope" logical fallacy. Traffic studies[1] have shown that changing speed limits do not really affect overall traffic speeds by all that much. What will change them are engineering methods that give indications to drivers that it's not safe to drive faster than X speed. So, posting a speed limit of 25 mph on a roadway that was previously posted at 45 mph without making any changes to the roadway itself isn't going to make much of a difference in terms of traffic speeds.

[1] http://www.ibiblio.org/rdu/sl-irrel/




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