15 minutes across the basin instead of 1 hour driving around. No bridge, no detour — just a straight crossing.
No bridge connects Arcachon to Cap Ferret. You must drive around the entire basin via Biganos and Lège — 70 km through narrow roads jammed in summer.
15 minutes straight across the basin. Board at the jetée Thiers in Arcachon, step off at Bélisaire pier in Cap Ferret. Done.