Where should a panoramic mirror be installed in a bus?

1. In the back of the bus, so that the driver can see all the passengers.
2. Correct answer: In the front of the bus, so that the driver can see all the passengers.
3. In the center of the bus, so that the driver can see all the passengers.
4. There is no need for a panoramic mirror, as the bus already has enough mirrors.

WhyA panoramic mirror is installed at the front of the bus so the driver can see all the passengers. Ordinary outside mirrors are not enough for that.