It's ludicrous - that's the reaction of many people living near the proposed site of a new tunnel beneath the Thames. It would run under the river east of Gravesend, with roads cutting through at least two villages. It's the preferred option for a new crossing between Kent and Essex. It was among proposals on show at the first public exhibition in Kent which had hundreds of people queuing today. Andrea Thomas was there. She spoke to Martin Potts from Highways England.