A bicyclist is at very big risk for catastrophic injury especially when struck by a car or a truck while riding.
This is because there is less physical protection to the bicyclist because the whole body is exposed to impact.
Because there is less protection to bicyclist when injured, it is important to take precautionary measures and wear a helmet.
A helmet will at least safeguard and potentially protect against a brain injury and possibly facial injuries though its not a cure all against a collision with an suv or an 18 wheeled truck.
Injuries such as traumatic brain injury, facial fractures, ripped flesh and broken bones are likely to occur when a bicyclist is struck by a speeding truck or car.
WEAR A HELMET, ABIDE BY THE RULES OF THE ROAD, NO TEXTING WHILE RIDING A BIKE AND PAY ATTENTION TO VEHICLES AROUND YOU!!!
STAY SAFE AND ENJOY THE ROAD RESPONSIBLY