What tells you that the passengers of the carriage suspected each other? Support your answer with evidence from the chapter.

Mr. Jarvis Lorry, a confidential clerk at Tellson's Bank of London, is on his way to Dover in a mail-coach. It is a cold night and he is wrapped up to the ears, so his physical appearance is concealed from his fellow-passengers, all of whom are strangers. The coachman fears his passengers just as they fear one another, since highway robberies are exceedingly common and any of them could be in league with robbers. So when he hears a horse galloping towards the coach on the road, he becomes fearful.