The word 行驶 is formed by combining two characters that both convey ideas of movement. The first character, 行, fundamentally means "to go" or "to travel". The second character, 驶, specifically means "to drive swiftly" or "to pilot". When placed together, they create a compound whose combined meaning is more specific than either alone, referring to the action of a vehicle (like a car, ship, or train) moving forward under its own power, effectively capturing the concept of "to drive" or "to travel in a vehicle".