Wisconsin Code § 346.40

Whistle signals
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(1) Whenever traffic is alternately
being directed to stop and to proceed by a traffic officer using a
whistle, such officer shall use the following whistle signals which
shall signify as follows:
(a) One blast of the whistle means that all traffic not within
the intersection shall stop.

(b) Two blasts of the whistle means that traffic which had
been stopped prior to the one blast shall proceed through the intersection and that the traffic which was stopped by the one blast
shall remain stopped.
(2) The traffic officer shall regulate the interval between the
one and the 2 blasts so as to permit traffic that is legally within
the intersection to clear the intersection.

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