Having considered 220 km of possible routes, the final report, delivered in September 1990, recommended an HSL starting from the Macon-Amberieu line below Polliat and entering Geneva either from the North or the South with a junction to the la Praille goods yard and a spur to Archamps to connect to the Longeray – Annemasse – Evian line. The most plausible option, at 77 km, bypassed Bourg to the North, passed through the Jura foothills in tunnels, used the Cize Bolozon viaduct to cross the Ain, paralleled the existing line at Nurieux, bypassed Nantua in a tunnel, crossed the Valserine to the North of Bellegarde, plunged through the Cret d'Eau in a 6750m tunnel, and arrived in the Geneva on the south bank of the Rhone. The crossing of existing rails at Nurieux and Chatillon-en-Michaille would have allowed construction to take place in phases.