LF-Routes are the long distance National Cycle Routes which cross the whole of the Netherlands from one side to another and from end to end. The LF-routes provide probably the best overall combination of path surface quality, signposting, scenery and separation from cars but they consequently attract the largest amount of recreational cycle traffic (including pelatons of racers training at speed near urban areas).
This profile uses the LF network, unless you specify route points that are not on the LF network. Outside the LF network, the route uses the numbered junction network and then the limited stops profile.