Reasons for purchasing an accidental death benefit rider
If you work in a potentially dangerous environment (with heavy machinery, for example) or drive more than average (either professionally or as a commuter), an accidental death benefit rider might be a good rider to consider adding to your policy.
Reasons that an accidental death benefit rider might become void
In general, an accidental death benefit will not be delivered if the death results from service in the armed forces or injuries sustained in war, illegal activities, self-inflicted injuries, or “hazardous hobbies” (such as skydiving, deep sea diving, motorsports, mountaineering, etc.), among other reasons. If you engage in any of these activities but you're still interested in purchasing an accidental death benefit rider you should consult with a licensed life insurance agent  to see what your options are.
Accidental death benefit rider cost
An accidental death benefit rider is not usually included in a basic life insurance policy. The addition of an accidental death benefit rider will probably result in a slightly higher premium.
Other types of insurance riders
Common types of insurance riders include: