9m(?) C-road, very limited on-road parking, reasonable surface
condition: needs more calming than that.
A point closure would undoubtedly be the cheapest option, but maybe
not acceptable. If traffic volumes are low then the triple cushion
approach should work well enough.
But assuming the volume of traffic is more than about 5000mvpd then
I'd go for narrow cycle lanes, a painted median and islands (with at
least 3.8m gaps between kerbs). The cycle lanes serve to maintain
calming and road-position between cushions, and substantially reduce
the squeezing effect of the islands. I'm not sure we really know the
best place for a cushion in those circumstances - I'd put it a bit
further than the recommended 1.2m from the kerb, and be tempted to put
it 1.6m from the kerb (which would centre it in the car lane), and
hope the cycle lane would discourage people from trying to squeeze
between the kerb and the cushion. I'm afraid we're still at the stage
of trying things and seeing if they work (so no I wouldn't hold the
designer liable).
Richard
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