Automatic in example sentence
In one of the rare instants in which the crowd was laughing (more in desperation to try to justify having been there already a full two hours to see nothing happening) was when the statement by a british tourist that he couldn't see things clearly since the Eurostar train was traveling at 180 miles an hour, was translated by the translator with automatic switch of units of measure from English System to Metric system to "they couldn't see things clearly since the train was traveling at 300 kilometers per hour".