Guidelines for Using Ground Transportation Unless traveling with a client, employees must use the most economical ground transit option available when traveling to and from airports, bus stations, and rail terminals. The following modes of ground transportation should always be considered first: •Buses, subways, and taxis •Ride-sharing services •Personal cars** As explained in the Group Travel section of this document, employees traveling to the same location should share ground transportation to and from the airport whenever possible. **Private car services require management approval and should be used only when a more economical mode of transportation is not available. What is the purpose of the double asterisks?