No warning signs for traffic where public footpath crosses dual carriageway Tingewick bypasd

A footpath crosses the A421 Tingewick bypass between Tingewick and Finmere just west of west well farm. Pedestrians crossing at this point descend the embankments are walk (or run) across the dual carriageway and ascend the embankment on the far side.

Should there be signs warning approaching drivers of pedestrians in the road? The bypass is high speed , it is a 70mph limit and some vehicles go much faster e.g. one biker caught at 157mph.

Crossing with the risk of high speed traffic is dangerous especially for vulnerable pedestrians e.g. elderly, dogs, children etc.

There is a tunnel under the bypass at finmere and a bridge over the bypass at wood lane Tingewick which is 0.5 miles away.

From a safety perspective it would be helpful there were signs at this crossing for pedestrians informing them of safe crossing points, ie on the north side inform pedestrians that they can cross using the finmere underpass and on the south side inform pedestrians that they can cross using the wood lane bridge. I've spoken to walkers locally who informed me that they crossed this dual carriageway and were unaware that those safer crossing sites exist. Informative signage at this dangerous crossing could mean pedestrians do not cross the dual carriageway unnecessarily.

In summary: 1. Should there be signage warning traffic of pedestrians in the road? 2. Could there be signage informing pedestrians of safer crossing points just before they would move to cross the road?