Why can't snow ploughs plough snow around speed humps?

Last winter I watched a snow plough come down a road heavily infested with speed tables and speed humps. Consequently the plough had to be raised and the road remain unploughed and dangerous. Another case to remove speed humps.

Asked on 5 December 2012 by BH, Goole.

Answered by Honest John
And one I've made many times. But have to keep making the same point hundreds of times before people see sense.
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