In reply to crayefish:
Not being facetious, but you have a bike with you, and it's only 100 miles, so couldn't you . . . .
I don't remember that coast road being a particular nightmare, bu I was there later in September.
One thing I do remember about cycling in Corsica is that they do use 'tar and grit' on their mountain roads. If you come across a 'fresh stretch' where there's no available diversionary route, then you, your bike and gear can easily become one grit encrusted tar ball. I had to buy a gallon of petrol and a scrubbing brush to get my bike working again.
Post edited at 09:20