A set of values used to specify the mode of travel.

TRAVEL_MODE_UNSPECIFIED No travel mode specified. Defaults to DRIVE.
DRIVE Travel by passenger car.
BICYCLE Travel by bicycle.
WALK Travel by walking.
TWO_WHEELER Two-wheeled, motorized vehicle. For example, motorcycle. Note that this differs from the BICYCLE travel mode which covers human-powered mode.

Travel by licensed taxi, which may allow the vehicle to travel on designated taxi lanes in some areas.

TAXI mode is an experimental feature. If customer requests TAXI route in a city where taxi lane data is not available, a DRIVE route is returned.