The Susten is the smoothest of the Swiss three-pass circuit. Built in the 1940s with wider sweeping curves than the Furka or Grimsel, it rewards a faster driving style. The east side from Wassen climbs through forest then opens into high alpine terrain with the Stein Glacier visible ahead. Surface quality is excellent — recently maintained. At 2,224m the summit tunnel is short and dramatic. Best driven east-to-west for the reveal. Fewer tourist buses than the Furka, more local traffic on weekends.
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