Noise is anything that might interfere with the communication
Huck decides not to tell anybody of Jim's escape because if Jim stayed back, he would have been sold. Huck and Jim are both alienated from the society in a number of ways. Their fates are linked right from the first part of the novel. Freed from the hypocrisy of the society they create a heaven of their own.
excused
pickup trucks, however, were excused from the seatbelt law for years……..
