You can use by with most forms of transport when you are talking about travel using that form of transport.
Most visitors to these parts choose to travel by bicycle.
I never go by car.
It is cheaper to travel to London by coach.
Don't use a determiner after by. For example, don't say `I never go by a car'. Also, don't use `by' when you are giving more detail about the vehicle. For example, don't say `I came by Tom's car'. You say `I came in Tom's car'.
If you want to emphasize that someone walks somewhere, you usually say that they go on foot.
They'd have to go on foot.
You can also use in when you are talking about travel using a car, taxi, ambulance, lorry, small boat, or small plane. Similarly, you can use in or into when talking about entering one of these vehicles and out of when talking about leaving one of them.
I always go back in a taxi.
She and Oliver were put into a lorry.
I saw that he was already out of the car.
However, you usually use on, onto, and off when you are talking about other forms of transport, such as buses, coaches, planes, trains, and ships.
...your trip on planes, ships and cross-channel ferries.
He got onto the bus and we waved until it drove out of sight.
Sheila looked very pretty as she stepped off the train.
You can also say that someone is aboard or on board these other forms of transport, especially planes and ships.
He fled the country aboard a US Air Force plane.
He hauled the fish on board his boat.
You usually use the verb get followed by a preposition to say that someone enters or leaves a vehicle.
Then I stood up to get off the bus.
They got on the wrong train.
The verbs board, embark, and disembark are used in formal English.
You use board to talk about getting on a bus, train, large plane, or ship.
He was the first to board the plane.
You can also use embark on to talk about getting on a ship and disembark from to talk about getting off a ship.
Even before they embarked on the ferry at Southampton she was bored.
They disembarked from the QE2 after their trip.
When you are talking about travel by public transport, you can use take instead of `go by'. For example, instead of saying that you will `go by' bus, you can say that you will take a bus.
We then took a boat downriver.
`I could take a taxi,' I said.
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