flying, ships, cars, trains, subways, bus
It tells them how far they have travelled, and/or how far the vehicle has travelled.
8
They travelled by ship.
They travelled by canoe, and on foot.
The ancient Romans travelled overland on foot, on carts or coaches or riding horses. The navigated rivers on boats and seas on ships.
people travelled by foot
Before Aeroplanes they travelled by ship.
two people travelled wearily across the desert
Mars is the furthest we have travelled. Not really. The Moon is the farthest for people. Unmanned craft have gone way beyond Neptune.
The Romans travelled on foot on carts or riding on a donkey. Richer people rode horses or travelled on wagons. They also sailed on ships.
The twelve who travelled with Jesus were his disciples humble fishermen.
The Vikings.