While the van driver was clearly at fault, it is quite common for people to cross over the DY, especially in left-handers. I see it ALL the time in the twisties.
It's much safer to get in the habit of staying to the right in blind right-hand corners.
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Countries I've ridden in: US, Canada, Ireland, UK, Germany, Netherlands, France, China, Singapore, Malaysia
States I've ridden in: Illinois, Connecticut, Massachusetts, Pennsylvania, California, Nevada, Missouri, Colorado