Paragraph 1

A relevant CB station may be used for sending and receiving only–

(a)

messages in plain speech; and

(b)

signals of–

(i)

less than 2.5 seconds in length, which are intended to call up any other relevant CB station; and

(ii)

less than 1 second in length, which are intended to identify, or mark the end of a message sent by, any relevant CB station.