Blaze bicycle lane laser

Has anyone checked whether a driver can actually see the ground 5m ahead of their nearside blindspot? If they can't this is yet another example of cyclists being given a dangerously false sense of security.

If you are 5m back in the blindspot of a HGV then often it's certain(the cyclists behind the first couple could easily be just lighting up the road inside the blind spot).

How big is a truck's blind spot? - YouTube