Another question to be answered: What is the way (with more than 100 nodes) with the highest density of nodes? it's https://www.openstreetmap.org/way/520625458 with an average of 1 node every 8.8mm (yes, millimeters)! The 95cm long way has 109 nodes!

This one's probably more dubious given the projection used, the top 1000 were all between 0.88 and 7.2cm/node