On Tue, 12 Feb 2019 11:18:31 +0100, "Carlos E.R."
wrote:

[snip]

There are thousands of people using phones normally, perfectly aware of
their surroundings. Obviously, we only notice the exceptions.

How do you know?

Many of the exceptions are when attention is required due to
conditions in the surroundings and the phone user is not up to. IOW,
this is a test of awareness that many fail.

Sincerely,

Gene Wirchenko