Apparently a large number of drivers do not know that they should not go past a red cross displayed on an overhead gantry on a motorway. It mean do not go pass this sign. The government are going to make change in the Highway Code so that drivers understand this better. Please see the link below.
https://www.drivertrainer.org/more-smart-motorway-safety-data-asked-for-by-government-with-revised-highway-code-on-the-way/?utm_source=DIA+Group&utm_campaign=42d6a69197-EMAIL_CAMPAIGN_2020_04_06_09_43_COPY_01&utm_medium=email&utm_term=0_4c4fc23759-42d6a69197-396723457&goal=0_4c4fc23759-42d6a69197-396723457&mc_cid=42d6a69197&mc_eid=50eb5973b4
Have a good weekend.
Mervyn