Yellow paint in Mitton Street

Jim mentioned some yellow markings in at the top of Mitton Street to Vale Road which I hadn't noticed; coming through that way today it's as if someone's gone mad with a paint can; the top half of Mitton Street and extending around the two corners into Vale Road and Lion Hill are covered in yellow markings on both pavement and road. So what are they up to? There's nothing listed for this week or in the forward planning section.