We had just bought a new bus for the local nursery, and as part of it we realized that we needed some way that the driver or anyone who was helping the driver on a tour could speak with the people who were actually sitting on the bus. This was really important, and so after taking some professional advice we decided to install a Bus PA System, which meant that the driver could talk through a microphone and tell people on the bus exactly what was happening and to give them instructions such as where to get off and what time they needed to be back on the bus.