Believe it or not while not while they arent usually fatal, its quite common for pedestrian MVA's in most urban centers. The low-speed nature of these type of accidents equate to mostly "fender bender" accidents and minor pedestrian injuries, but in urban environments people (usually distracted by cell phones) do have a tendency to not pay attention because of the security of low speed and boom do stupid things. Though in those instances the high-visibility vests don't really get a chance to come into play, you'd be amazed how often people can ignore flashing lights and still cream the rear of your vehicle.
To have people killed in most of these instances of accidents would be extremely rare, unless it was a large vehicle like a bus or a heavy truck, but it is quite common in most major cities to have pedestrian vs vehicle mva's as a result of either the pedestrian or the operator of the vehicle not paying attention.