They...
They travel by car.
They...
They travel by bus.
They...
They travel by ferry.
He...
He travels by motorbike / motorcycle.
She...
She travels by bike / bicycle.
She...
She travels by train.
He...
He travels by canoe.
He...
He travels by scooter.
They...
They travel by space shuttle.
They...
They travel by hot air balloon.
They...
They travel by van.