Ever since December 8 2022, lots of roads and airports were closed due to political demonstrations in southern cities. Some of it has been cleared, but it's resumed in Lima - my friend arrived there one week ago and the roads across the mountains were shut down again, and buses weren't running. They had to take car rides along the back roads which took longer. I recall hearing more than once that Machu Picchu was closed and tourists were stranded as a result. The other comments describe the why and how, but getting around certain parts of Peru are somewhat difficult at the moment.