More relevant nowadays, due to the ubiquitous nature of transportation, I suspect would be seeing a map that charts not time necessary to reach a location (afte

More relevant nowadays, due to the ubiquitous nature of transportation, I suspect would be seeing a map that charts not time necessary to reach a location (after all 72-96 hours would cover the overwhelming majority of the globe) from a given starting point but rather the nominal cost associated with doing so.