Amusement parks in Japan ask visitors not to scream on roller coasters. Reason why? Screaming can produce droplets from the mouth, which can contribute to the spread of germs and the transmission of the COVID-19 virus.
According to a CNN report, 30 amusement park operators in Japan who are members of the East and West Japan Theme Park Associations, proposed banning screaming/shouting, or cheering in parks (including when riding roller coasters) as one of the protocol safety procedures after theme parks reopened after coronavirus epidemic.
East and West Japan Theme Park Associations consist of many theme parks, including Tokyo Disneyland, DisneySea, and Universal Studios Japan.
In addition to the "no screaming" rule, the association also issued other guidelines to maintain the safety of employees and visitors, including improving hygiene and sanitation, using face masks, checking temperature and social distancing restrictions. Conversations are encouraged to be brief or to use a combination of gestural communication styles such as hand gestures or eye expressions.
