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An abandoned intercity bike highway
(lemmy.world)
Saw this oddity last month in Murcia province, Spain. A dedicated bike path that extends for over 30 km and appears to have zero users. It follows the service road of the main RM-1 highway from Murcia city all the way to the coast (just south of Alicante). The service road has almost zero traffic (I passed two cars in 20 km), rendering the bike path completely superfluous, hence its state.
The mean weather in Murcia during summer is about 35C. Definitely depends on your fitness how noticeable 287m of climbing is. Komoot rates it "moderate" and suggests it's doable in 1h 40m with max inclines of 4% or so.