The long climb to the summit of the Bonette is notable for two things – it’s the highest paved road in the Alps and the finish (built solely to achieve the aforementioned honour) is brutally steep. Despite being famous for its altitude the Bonette has only featured in the Tour four times. Presumably because the road doesn’t really go anywhere useful.
John-Lee Augustyn led over the summit the last time the Tour went over the Bonette (in 2008), but fell on the descent. Curistas were treated to altitude and views on a glorious day in 2017, thankfully with no tumbles on the way down.