Re central reservations on dual carriageways: I did this for my local map: http://www.transportparadise.co.uk/cyclemap/?zoom=2&lat=51.7245&lon=-1.24708&layers=B0FF
by adding a barrier=central_reservation way (with a further tag saying what it was dividing) I'd be a bit wary of using a two-stage casing to achieve a similar effect, because 1) it'll take a lot of fiddling to get it to look good at a variety of zooms, and with a variety of carriageway-separations 2) it's hard to make links work (you have to interweave the casing levels) Richard
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