Figure 6F-6. Advance Warning Arrow Display Specifications
This figure illustrates advance warning arrow display specifications.
On the left side of the page is the heading "Operating Mode".
Three operating modes are shown, with the representative advance
warning arrow panel displays shown as yellow dots on a horizontal
rectangular black background on the right side of the page under
the heading "Panel Display (Type C panel illustrated)."
Below the above heading on the right side of the page is the notation
"(Right arrow shown; left is similar)."
Under "Operating Mode," the first heading is "I.
At least one of the three following modes shall be provided:"
Under that heading, the following listings are shown under "Operating
Mode," with accompanying illustration and text under "Panel
Display":
- "Flashing Arrow": A panel display is shown of a horizontal
arrow pointing to the right, with a shaft composed of five yellow
dots leading to an arrowhead composed of five yellow dots. A note
under the panel display illustration states: "Move/Merge
Right."
- "Sequential Arrow": Three separate illustrations of
panel displays are shown, each displaying a horizontal arrow pointing
to the right, with an arrowhead composed of five yellow dots.
The shafts of the arrows in the three separate illustrations are
composed of two, three, and five yellow dots, respectively. In
each of the three illustrations, the left-most yellow dot of the
arrow shaft is located near the left edge of the panel and the
arrowhead is just to the right of the right-most dot of the shaft.
A note under the panel display illustrations states: "Move/Merge
Right."
- "Sequential Chevron": Three separate illustrations
of panel displays are shown, each displaying one or more chevron
arrows pointing to the right, with each chevron arrow composed
of five yellow dots. In the first of the three illustrations,
one chevron arrow is shown, located at the left side of the panel.
In the second illustration, two chevron arrows are shown, located
at the left and center portions of the panel. In the third illustration,
three chevron arrows are shown, located at the left, center, and
right portions of the panel. A note under the panel display illustrations
states: "Move/Merge Right."
Under "Operating Mode," the second heading is: "II:
The following mode shall be provided: Flashing Double Arrow."
Under the heading "Panel Display," a double-headed horizontal
arrow is shown composed of three yellow dots in a horizontal line
with each arrowhead composed of five yellow lights. A note under
the panel display illustration states: "Move/Merge Right or
Left."
Under "Operating Mode," the third heading is: "III.
The following mode shall be provided: Flashing Caution." Under
the heading "Panel Display," two separate illustrations
are shown, separated by the word "or." One illustration
shows four yellow dots, one near each of the four corners of the
display panel. The second illustration shows a horizontal row of
four yellow dots. A note stating "Caution" is shown under
each of the two illustrations.
A table shows the following—minimum size, minimum legibility
distance, and minimum number of elements—for the four panel
types:
- Panel type A: minimum size 1200 x 600 mm (48 x 24 in), minimum
legibility distance 0.8 km (1/2 mi), and minimum 12 elements.
- Panel type B: minimum size 1500 x 750 mm (60 x 30 in), minimum
legibility distance 1.2 km (3/4 mi), and minimum 13 elements.
- Panel type C: minimum size 2400 x 1200 mm (96 x 48 in), minimum
legibility distance 1.6 km (1 mi), and minimum 15 elements.
- Panel type D: minimum size "None*", minimum legibility
distance 0.8 km (1/2 mi), and minimum 12 elements. A note states
that asterisk (*) indicates "length of arrow equals 1200
mm (48 in), width of arrowhead equals 600 mm (24 in)."
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