In most tobogganing situations, I don't think the risk of head injury is particularly great. Certainly less than many playgrounds, climbing structures.
Conditions that be be in place that would increase chances of head injury:
Particularly hard packed snow
Crowded hill
Other obstacles near landing area.
"Cross Traffic"
Attempting to go over jumps
I briefly took my kids out to a school yard on Christmas Day. Snow was deep, no one else around. Because of the snow conditions, speeds couldn't get too high. Walking up our hardwood stairs in our house most definately provides a greater risk of head injury than that sledding.
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