In Flanders, the best advice to give a disoriented cyclist is: Keep calm and check your crossbar. Many riders haul a string of numbers with them, preprinted or handwritten on a piece of paper. This jumble looks like a telephone number, but it’s really an itinerary: The numbers are a roadmap to the route. Nearly 220 miles of cycling paths wind through the region in northern Belgium. The Flemish biking network is called fietsknooppunten, and it’s made up of knooppunten (Dutch for “nodes” or “points”), junctions where cycling paths intersect….
