Over The Hill said:
Excellent idea's OTH and they have all been considered already, the "whats around the corner" message was deemed not hard hitting enough for short term exposure and research has shown that using the term 'corner' with pleasant imagery of said corner with no sign of danger may be seen as a challenge (how fast can you take it).
as for "expect the unexpected"... well it is already part of the message and in supporting material, honest!