Can I use a smartphone etc. in a municipal bus?

Turn off the power of devices that emit radio waves, such as smartphones, when crowded near priority seats. In other places, please set the manner mode and refrain from calling. In addition, please use earphones etc. for sound and take care of sound leakage.
Also, please refrain from operating your smartphone as it is dangerous when you are standing.
※Congestion refers to cases where the customer's body is crowded enough to interact with each other.