When traveling somewhere by vehicle, we use "by" to indicate the mode of transportation. Common examples include "I go to school by bus" or "She goes to her office by car." When traveling on foot, we use "on foot" rather than "by foot." When traveling by car, van, taxi, or cab, we use "in," "into," or "out of" to describe getting in or out of the vehicle. Examples include "He took to his office in his car" or "I saw her getting into the cab."