LF meaning in Sports ?

LF-Routes (Landelijke Fietsroutes, Dutch for countrywide cycling routes) are long-distance cycling routes that form a network in the Netherlands and Belgium. The routes, criss-crossing both countries, are primarily intended for recreational multi-day bike tours, such as cycling holidays. Some routes are also part of a wider international network.

Most of the LF routes have been signposted in two directions, inscribing one direction with the letter "a", the other with the letter "b": the North Sea Route LF1 southbound from Den Helder to French Boulogne-sur-Mer is called LF1a, while in the other direction it is called LF1b.