Route Information clues will sometimes specify one or more modes of transportation that teams must take. This may include prearranged travel or for charter flights, buses, or boats to more remote locations. Teams may also be provided with a rented vehicle and will be required to navigate themselves with it until further notice. Route Information clues may also restrict teams to specific modes of transport, such as requiring them to walk to their next destination. Teams who fail to follow travel instructions will usually be required to go back and follow them correctly if possible, or else they will receive a penalty at the next pit stop (See "Penalties and time credits", below")". If no mode of transport is specified, teams are free to use any option available excluding private vehicles.