Douglas daily dispatch., 1926-02-04


finally approved, and has now adopt
ed numbers for all the state high
way routes
/ "The markers and signs adopted
bv the Arizona highway department
are divided into four general classes,
to-wit:
Trunk Highway Markers.
| 2.--Warning and caution signs.
3=Information and guide signs.
Especial markers.
J "All signs in classes 1, and are
black letters and border on white
background, and all signs in class 2
are black letters and borders on a
yellow background. Dimensions of
signs and lettering will conform to
those shown on these drawings. Posts
to be minimum inch diameter pipe
painted yellow.
'All highway markers and signs
placed primarily for public benefit will
be set on the rght-hand side of the
road and approximately one foot out
side the shoulder line or at such dis
tance from the travelled way as to
avoid interference with traffic and
maintenance, and will in all cases be
placed with the idea of maximum ln-
eht~ncted visibility.
"The height above subgrade will be
approximately two feet to bottom of
lowest sign, except in cases of as
cending and descending grades when
the heights will be adjusted so that
the rays from headlights will strike
the sign. On town and city streets,
where parking of cars along the curb
is likely, signs will be placed about
seven feet above curb, so as to be
visible above parked vehicles.
Highway route markers will be
placed on right side of and at right
angles to the road, beyond all inter
sections and also in advance Of inter
sections where the trunk highway
turns. In the latter case the proper
direction letter (R or u will be plac-
ed Immediately under the rnarker.
where two trunk routes separate,
the marker, for each route with cor
rect direction letter will be placed on
or Junction, with the United States
route at the top, or in case Of two
United States routes, the lower num-
bered route at the top; this arrange
ment also holds where several trunk
routes are on the same highway. is;ee
No. and VII on Plate H3.l
t'Route markers will be placed fre-
quently enough along the highway so
that traveller will have no doubt as
to the desired route
Warming Signs
''The shape and color of ali warning !
signs are standardized, to-wit:
Round Indicating Railroad Grade
Crossing
Octagonal indicating stop"
Diamond shape indicating "Slow."
Square shape Indicating Caution
warning signs will be used only
where actually necessary, as their too
frequent use will minimize their value
as a warning to the travelling public.
"a definite study will be made of
each situation requiring warning
and the desired sign placed on the
right hand side of the road, from 800
feet to 500 feet in advance of the dan
ger point, conditions making it gdesir- !
able to vary this distance at different |
locations.
Railroad Crossing signs D1 and DE-
are for grade crossings only and as
the railroad companies are required to /,
maintain larger signs at all crossings,
our signs will serve as advance warn
ing and will be placed as such.
stop signs D3 are to be used only :
where a full stop is required and
when used on the open road are an
indication of an actual danger to
life or property and requiring all We
hicles to come to a full stop.
Signs 81 and 81 are to be used at
=
necessary for safe driving The safe
speed may vary with degree of curve
and while 10 degree curve in the
mountains may not require a low sign
a 6 degree curve at the end of a long,
straight away may be a source of !
danger.
"signs So and s4 are to be used for
reserve curves.
"Signs SIS and Sc are for right Angle !
turns and are not to be confused with
the curve signs 81 and So.
"The hill sign 81 will only be
used in cases where a hill is a source
of danger either by day or night driv
ing, as a very sharp vertical curve or
abrupt change in grade. When in
steep country, the sign "Hin End
Gear" So will be used on descending
grades over per cent.
"The too frequent use of the slow
sign SO may reduce the value Of all
other slow signs, if used where not
absolutely needed, but when used with
little study is most versatile of
signs. 1t can be used frequently IN
a rough mountain country as con-
stant reminder of careful driving or
as a temporary sign around new
works or reconstruction. It can be
used in conjunction with signs of
temporary nature, as washouts, etc.
signs, such as S13 and $40, Loose
Gravel and Narrow Bridge, are to-
be used as indicated by the signs
themselves, excepting that care mus
be taken in determining what mar