13.. depending on the car, the road surface and the person concerned… Note that when "concerned"is used after a noun, pronoun, or a noun phrase it means involved e.g. Id like to thank everyone concerned for making the occasion run so smoothly It was quite a shock for all concerned. everyone involved 14 You can become literally" drunk with sound Drunk with sound"being a metaphor, the whole sentence means that too much infra-sound can really make you unable to udge in a sound way cf. drunk with sth. behaving in a strange, often unpleasant way because of the excitement of something e.g. drunk with power/success13. ....depending on the car, the road surface and the person concerned ... Note that when "concerned" is used after a noun, pronoun, or a noun phrase, it means "involved". e.g. I'd like to thank everyone concerned for making the occasion run so smoothly. It was quite a shock for all concerned. (= everyone involved) 14. You can become literally "drunk with sound". -- "Drunk with sound" being a metaphor, the whole sentence means that too much infra-sound can really make you unable to judge in a sound way. cf. drunk with sth.: behaving in a strange, often unpleasant way because of the excitement of something e.g. drunk with power/success