Those required to wear a helmet are...
A)only the drivers of two-wheeled motorcycles without a sidecar.
B)only the passengers of two-wheeled motorcycles without a sidecar.
C)the drivers and passengers of two-wheeled motorcycles, with or without a sidecar.Correct
Drivers and passengers of motorcycles or motorcycles with a sidecar, three-wheeled vehicles and quadricycles, mopeds, motorised cycles and special quad vehicles must properly use approved or certified protective helmets in accordance with current legislation, when travelling on both urban and interurban roads.
This is because the helmet is a very important passive protection element that can protect us from very serious injuries.
In the case of bicycle riders, they are only required to wear a helmet when travelling on interurban roads, or if they are under 16 years of age on any type of road, except on prolonged uphill slopes, for medical reasons that must be certified, or in extreme heat conditions.