This blog began as a description of our life in Al Ain, UAE (United Arab Emirates). Brn worked at the UAE University Libraries Deanship for three years and Bss homeschooled our four children, D, B, P, and O. After returning to the the USA for five years, we are living in Abu Dhabi now.
I know that this isn't what this sign means,
but because it says "and" and not "or", if taken literally, this means that you can do one or the other as long as you don't do both.
(The subway is the pedestrian tunnel under the road, not an underground train.)