I biked there last Friday. The bike road in the middle is fine, no problem with that, but there are many sub-roads, going up and down on the embankment, and every road had a sign banning to go on them by bike. I noticed them, because every road there had such a sign. Every. In Prague I don't see such (I live there), but in Austria it was noticable. I also made a photo of the sign, if you need. So there only the main road in the middle, the bike road counts.    