Actor and broadcaster Sir Tony Robinson has said plans for a tunnel near Stonehenge in Wiltshire are too "old-fashioned" in outlook.
The 70-year-old Time Team presenter joined anti-tunnel campaigners to fight the plans, saying they placed the area's wider archaeology at risk.
The protest by the Stonehenge Alliance was staged outside a consultation event in London earlier.
Highways England said it was working to find "the best solution possible".
The public consultation on its plans for putting the A303 into a 1.8-mile (2.9km) dual carriageway tunnel runs until 5 March.
Highways England says the move would cut congestion and improve journey times.
The scheme has the backing of English Heritage and the National Trust.
Speaking outside the Society of Antiquaries at Burlington House, Robinson suggested a longer tunnel.
He said: "I think the proposal we are being offered is a really old-fashioned one.
"It assumes what needs to be protected is that little clump of stones."
Full story here : http://www.bbc.co.uk/news/uk-england-wiltshire-38885462