There are cycle roadsigns, which are great when present, but...often either missing entirely, or for some strange reason the one you need is ripped off the pole, so you can see where it was. Sometimes the signs are set some distance back from the junction, and the only way to tell if you have gone the right way is to ride past the sign intended for people travelling in the opposite direction.
Surfaces vary a lot, from the incredibly smooth to deep, soft sand. Gordon has put up a picture of a typical German "double tyre track" concrete affair, but one of the most common is brick-sized blocks in a herring-bone pattern. Very often, these are heaved, or missing, and the ride becomes extremely rough. Most cycle routes are classed (sensibly) as part of the hughway, so that there are give way lines set back on side roads. Many times, as I approached a side road, a car pulled right across the lane would reverse back out of my way---quite incredible if you're a Brit!
The Cormorant is spot on with the swapping from side to side, and there are as a consequence many two-way lanes, complete with dotted centre line. There are also, unfortunately, a lot of shared-use paths.
Ferries in the Netherlands and Germany operate a logical system: if they take you across a natural water course, you pay, but if the obstacle has been created (canals) they are free.