Interesting reading, but the only real point they make is that the study only observed this effect on 40mph and 50mph roads, and it did not show up in the test on a 30mph road. Everything else is supposition.
And even some of the supposition is half-cocked
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I'm sure Spokes is full of well meaning people, but their enthusiasm for paint on the road IMO is particularly stupid. There are a lot of narrow red gutters and round-about decorations round here with all the familiar problems. There's at least the possibility that Spokes has actually contributed to making cycling in Edinburgh more dangerous.