Dave Derby began detecting in 1964 and his finds include a Saxon warrior and a Roman villa.
A parish council chairman calls it "a further blow to local participation in decision-making".
Work on the Sandy Lane relief road in Northamptonshire began more than 15 years ago.
Work to complete the Sandy Lane relief road, near Northampton, is expected to start soon.
Flood rescues continue in Northamptonshire as warnings remain in place.
Heledd Jenkins is challenging herself to raise £4,000 for the Northampton Saints Foundation.
Sandy Lane, between Duston and Harpole, was due to reopen in March but it remains closed.
It comes top in a survey of lorry drivers, who praise the quality of its food and service.
Officers are trying to establish the last movements of Katherine Corrie, 49, known as Katy.
