Is it obligatory to install a mirror on a motorcycle?

1. No, except for motorcycles and a side-car.
2. Correct answer: Yes, it is lawfully required on all types of motorcycles.
3. No, the driver can decide at his own discretion whether or not to install a mirror.
4. Yes, but only on motorcycles with a sidecar.

WhyYes, every motorcycle must have a mirror.