There is a small footbridge connecting these roads at approximately this location. It's shown and clearly visible in Bing Maps (Google hasn't yet added this to StreetView): https://www.bing.com/maps?osid=c5b16b04-891f-4a52-96ad-6e432dca0684&cp=38.636459~-90.40021&lvl=19&dir=322.28625&pi=-4.2359242&style=x&mo=z.0&v=2&sV=2&form=S00027 