Basque transport observations

Some observations on Basque transport (could be Spain-wide, could be Basque-wide, could be one-offs) Main roads » A lot of Basque main roads carve through a hilly landscape at great height, the concrete viaducts arguably despoiling the landscape but far better than wending at ground level. » This can mean a lot of tunnels through hillsides. Most Basque tunnels are of a similar design (twin-bore half-cylinders with a concrete shell). Each has a sign at the start saying how long it is (could be 106m, could be 3377m). » All main roads have posts every kilometre stating which road it is and how many km along you are. » Motorway junctions aren't numbered consecutively, instead matching the number of kilometres along the road. Thus exit 379 might be followed 6km later by exit 385. This also makes it easier to calculate the length of a journey, e.g. junction 12 (San Sebastián) to junction 115 (Bilbao) is 103km. » Speed limits change a lot, often in steps of 20km/h, especially on the edge of…