Don't play the Tuba on the freeway in Shenzhen

I arrived in Shenzhen/China at about 8pm last night for the Embedded Systems Conference China - Just across the street from the hotel there's an interesting road sign... Which includes a Speed Restriction sign (40kph) and a sign that clearly shows that playing the Tuba while driving is not allowed (see enlarged image below).

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I could imagine restrictions on using a cell phone, drinking Starbucks, reading the newspaper - but playing the Tuba? - Really?

No_Tuba

- Mike