In an emergency, speed of response is a crucial factor in safety. Many people are familiar with 911 as the primary emergency number in the United States, but an important question arises: what about the use of 911 in Indonesia? Is it valid? In an emergency, speed of response is a crucial factor in safety. Many people are familiar with 911 as the primary emergency number in the United States, but an important question arises: what about the use of 911 in Indonesia? Is it valid?