The key here – and on other, complex traffic lighted roundabouts – is information. See it early, process it early and act on it as soon as is appropriate. This is much easier when actively searching for information, rather than “just noticing” it.
“I should make sure my clients can deal with this before they go for test,” I thought to myself, and then started thinking further. Just how many tricky junctions might my clients find on York test routes?