It is supposed to be vehicle:conditional as it's a no vehicles sign (red circle, blank in the middle) rather than a no motor vehicles sign (red circle, with a symbol of a car & motorbike in the middle). The no vehicles sign prohibits all vehicles including bicycles being ridden. To tag it with the 'minimum' access you would have to do it as vehicle=no. You wouldn't really need to add bicycle=no as that's already implied by vehicle=no, and foot=yes is already is implied by the highway=residential tag so is unnecessary.