at the provisional terminus at Avanchet, or at the permanent termini at Meyrin–Gravière and CERN, as well as the inclusion on this section of several stations with island platforms, made necessary the exclusive use of bidirectional vehicles to run services on the section. As the numbers of the Flexity Outlook trams in the fleet were then rather limited, the TPG exercised its existing option for 17 more vehicles, while in the meantime the previous through-connection of line 12 with line 16 at the Moillesulaz terminus had to be suspended. According to various sources, the opening of the second stage of the TCMC (Avanchet–Meyrin) took place on 12 December 2009, with the entry into service of the section to Meyrin (Gravière). On 30 April 2011, operations commenced on the section to CERN. The TCOB route to Bernex P+R, which includes, amongst other things, a second crossing of the Rhône, went into service at the end of 2011. The first – very short – section of this route, between Coutance and Genève-Cornavin station, had already commenced operations at the timetable change in December 2010. A new line 18 ran on the route, and was extended to CERN in May 2011. For the inauguration of the TCOB route, the TPG ordered 32 Tango trams, made by the Swiss company Stadler Rail. Like the Cityrunners, the Tango trams are bidirectional. After the new route to Bernex P+R was commissioned, the network was simplified. There are now only four tram lines, nos. 12, 14, 15 and 18. The use of the previous lines 13, 16 and 17 were discontinued, and only one line now operates on most section of track. Although these changes simplify tram operations, they also mean that points on the inner city sections, and in particular Genève-Cornavin station, can no longer be reached from all parts of the network (e.g. Genève-Cornavin is no longer directly served by line 12) without the need to change trams en route. Lines Interchange stations, which enable transfers between the lines, are located at the following stops: Genève-Cornavin railway station Genève, Bel-Air Genève, Stand Genève, Plainpalais Projects Two cross-border extensions are planned, one towards Saint-Julien-en-Genevois via Plan-les-Ouates, and the other an extension of line 17 towards Lycée des Glières in Annemasse. An extension of line 15 is proposed between Place des Nations and Le Grand-Saconnex, with a possible extension to Ferney-Voltaire in France. However, the realisation of