●In Directives, Light sources & Traffic engineering:
A
at
or
to
when it may be
to
,
or
, using a
code.
●In Directives, Light sources, Roads & Traffic engineering:
A
at
or
to
when it may be
to
,
or
, using a
code.
A
by one or more such devices.
●In Directives, Light sources & Traffic engineering:
A
using the three
of a
(green, yellow/amber, and
) as a metaphor.
●In Philately, Directives, Light sources & Traffic engineering:
The
on
with
or
methods, used by the
to
accuracy.