Peter Roberts, of North Wales Traffic Control, said falling icicles were a real danger.

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Peter Roberts, managing director of VerdErg, said "certain characteristics would make the Camel river suitable for the technology".

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Among those taking part in the Newsnight debate was the man who started the petition - Peter Roberts, a 46-year-old account manager from Telford.

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Peter Roberts, from the Alliance of British Drivers which organised the petition, told BBC Radio 4's Today programme that tolls would be a political disaster.

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There was another Lions scare when Roberts departed after the break with what appeared to be a right shoulder injury following a tackle on Peter Stringer.

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