Illegal U turns damaging traffic island etc

Downham Market. Junction of Downham Road with the A1122 Downham bypass, (the staggered crossroads between Downham Market and Denver).

A housing development (Broadoaks), is being build off the A1122, to the North, between its junction with the A10 and the junction with Downham Road, (detailed above).

There is no right-turn into 'Broadoaks' from the A1122. A sign at this location instructs vehicles (mainly HGVs), that they must continue along the A1122 and make a U turn at the roundabout with St John's Way, (just beyond the level crossing).

However, as you can see from the attached photos, some HGVs are making a U turn at the Downham Road junction, by driving across the traffic island, (at the end of Downham Road), between the 'keep left' bollards at each end of that island.

From here, they continue across the kerb, then across the grass at the left side of Downham Road, and down the kerb, back on to the A1122.

Signage is needed at this junction as well as a concrete fence piece, or similar SUBSTANTIAL object , on the traffic island, to prevent this selfish and dangerous conduct.

The matter should also be brought to the attention of the building developer who, ultimately, is responsible for this situation.