If you're going down the highway on a crotch rocket at speeds of more than 55 MPH and spill you're gonna end up at St Pete's doorstep. Whether your brains are enclosed in a bright shiny plastic container or not.
Some stats from
MSP - Motorcycle Helmets
Motorcycle crash statistics show that helmets are about 37 percent effective in preventing crash fatalities. The National Highway Traffic Safety Administration estimates an unhelmeted rider is 40 percent more likely to suffer a fatal head injury and 15 percent more likely to incur a nonfatal head injury than a helmeted motorcyclist.
Facts
* Head injury is the leading cause of death in motorcycle crashes. (U.S. Department of Transportation/National Highway Traffic Safety Administration, State Legislative Fact Sheet)
* Helmets are estimated to be 37 percent effective in preventing fatal injuries to motorcyclists. (NHTSA Traffic Safety Facts, Motorcycles, 2006)
* Wearing a properly fitted helmet can actually improve the rider's ability to hear by streamlining the head and ear which can deduce wind noise allowing the rider to hear other sounds. (Safe Cycling-Motorcycle Safety Foundation Publication.)
* Helmets prevent eye injuries and distraction from dust, dirt and debris thrown up by other vehicles on the road. (Safe Cycling-Motorcycle Safety Foundation Publication.)
Further, from
A Dozen Deadly Motorcycle Safety Myths - Motorcycle Cruiser Magazine:
Myth 4: Helmets Block Your Ability to See or Hear Danger
The thing you learn when you dig into the research is that motorcycle riders who use helmets crash less frequently than those who don't. Maybe that happens because motorcyclists who decide to wear helmets have a better or more realistic attitude about riding. Maybe it's because putting on a helmet is a reminder that what you are about to do can be dangerous and the act of accepting protection puts you in the right mindset. Maybe it's because a helmet provides eye protection and cuts down wind noise so you can actually see and hear better. Maybe its because, by cutting wind pressure and noise, a helmet reduces fatigue. Whatever the reasons, wearing a helmet clearly does not increase a motorcyclist's risk of having an accident and wearing one correlates to reduced likelihood of an accident.
Myth 5: A Helmet Won't Help in Most Crashes
People look at the seemingly low impact speeds used in motorcycle-helmet testing and assume that if you are going faster than that, the helmet will no longer be up to the job. That ignores a few critical facts:
* Most accidents happen at relatively low speeds.
* Most of the impact energy is usually vertical?the distance your head falls until it hits.
* Helmets (or at least helmets that meet DOT standards) perform spectacular life-saving feats at impact speeds far above those used in testing.
* When a helmeted rider suffers a fatal head injury, it frequently doesn't matter, because, to hit hard enough to sustain that fatal injury, he sustained multiple additional fatal injuries to other parts of his body. In other words, the fact that the helmet didn't prevent the head injury was of no consequence.
The numbers clearly say that riders using DOT helmets simply survive crashes more successfully than those without them.