In U.S. v. Knotts (1983) 460 U.S. 276, the court addressed the narrow issue of whether the monitoring of beeper signals require a warrant. (Knotts, at p. 285.) The Knotts court concluded that monitoring a beeper placed in a container, which was used to track the movement of a vehicle transporting the container, was not precluded by the Fourth Amendment because the information obtained "amounted principally to the following of an automobile on public streets and highways." (Id. at p. 281.) Knotts observed that "a person travelling in an automobile on public thoroughfares has no reasonable expectation of privacy in his movements from one place to another . . . because he voluntarily conveyed to anyone who wanted to look the fact that he was travelling over particular roads in a particular direction, the fact of whatever stops he made, and the fact of his final destination when he exited from public roads onto private property" (id. at pp. 281-282), and reasoned the use of a beeper to obtain the same information did not violate any reasonable expectation of privacy and therefore the monitoring did not require a warrant. (Id. at pp. 282-283.)