Work is to begin to find a suitable place for a new river crossing for Great Yarmouth, in Norfolk.
The study for the River Yare crossing will last six weeks
The county council will carry out six weeks of ground investigations from 6 August around Harfreys Roundabout, Southtown Road and South Denes Road.
The council said particular care has to be taken because of the risk of unexploded bombs from the extensive wartime raids suffered by the town.
The crossing, either a bridge or a tunnel, aims to reduce congestion.
The council is contacting landowners asking for their consent to carry out the investigations.
Where groundwater levels are being investigated, this will be monitored monthly over a whole year.