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=13003c2c-7f3b-4122-8a8f-100fbb63f9c5&cp=38.718464~-90.311857&lvl=19&style=h&v=2&sV=2&form=S00027