Deputy Derham says when motorists have no option but to mount the kerb, they can do so - as long as they are careful.

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None is likely to mount a counter-offer: option clauses in First Union's deal make it prohibitively expensive for another bidder to undo.

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If it is found to be on a collision course, one option governments have is to mount a deflection mission.

BBC: Foresight mission spacecraft Image