Barry

Three points are computed, weighted, then averaged.

• The halfway mark, by time or by distance, on the longest trip between all the cities ×13
• The average of the cities' coordinates ×2
• The centre of the frame holding every city ×1

Their average gives the point: the best approximation of a place that is fair to everyone's journey.

Worldwide routing is by car only, always along the fastest roads.

Enter confirms and opens the next line + adds a city, − removes it