Average travel time to human settlement of 500,000 or greater population. (aggregation type: AVG)
Average travel time to human settlement of 250,000 or greater population. (aggregation type: AVG)
Average travel time to human settlement of 100,000 or greater population. (aggregation type: AVG)
Median travel time to nearest principal port. (aggregation type: AVG)
Median travel time to human settlement of 50,000 or greater population. (aggregation type: AVG)
Median travel time to human settlement of 20,000 or greater population. (aggregation type: AVG)