Using 2 different relations solve also the problem of a terminus. See <a href="http://www.openstreetmap.org/edit?lat=50.85077&lon=4.75625&zoom=17">http://www.openstreetmap.org/edit?lat=50.85077&lon=4.75625&zoom=17</a> for the example 'Pimberg" (end of line 9 Bertem-Leuven-Pimberg). The 9* is the route backward (Pimberg - Leuven - Bertem).
<div><br></div><div>See also <a href="http://wiki.openstreetmap.org/wiki/WikiProject_Belgium/Conventions/Bus_and_tram_lines#Bus_stops_De_Lijn">http://wiki.openstreetmap.org/wiki/WikiProject_Belgium/Conventions/Bus_and_tram_lines#Bus_stops_De_Lijn</a> about bus_stops. </div>