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The energetic crowd waved American and Mexican flags, banged drums and unleashed noisemakers as they paraded along the sidewalks.

“If you have sporting events on campus and people are using noisemakers or screaming at the top of their lungs, the time, place and manner is never applied,” she said.

Cicadas, winged buggy noisemakers whose relatives include leaf-hoppers and spittle bugs, come in two varieties: the annual cicadas who, sure enough, appear every year and the periodical cicadas, who appear in 13-year and 17-year cycles.

The match will be played at the Allianz Arena in Munich, but a "prohibited items" list for the stadium warned fans to avoid bringing "mechanical or electronic noisemakers, such as megaphones and air horns".

The engine is so quiet that it has a noisemaker — emitting a high-pitched hum like a synthesizer — as a safety measure, so pedestrians hear the bus rolling up.