There is a controlled access gate at this location, closing Express Way to public traffic, as it's part of of the Express Scripts parking lot/office park. The gate is visible in the Bing satellite view: https://www.bing.com/maps?osid=1abd464c-8043-4b87-bced-87e947f18bcc&cp=38.719326~-90.307562&lvl=19&style=h&v=2&sV=2&form=S00027 