By car, by bus, by train but on foot

[Guest]

Test No. incompl/inter-8 "Going on foot", question 1

I'm tired of waiting for buses, I'm going there ......... foot.

(a) with
(b) on
(c) to
(d) by

Test No. incompl/inter-8 "Going on foot", answer 1

I'm tired of waiting for buses, I'm going there on foot.

Correct answer: (b) on

Your answer was: incorrect
I'm tired of waiting for buses, I'm going there by foot.
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It is not "by" that is used the most?

[Alan]

Yes, on foot is the exception and we say by with the following: train/car/ship/plane/bus.
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English as a Second Language
You can read my ESL story Colour Idioms