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APPENDIX O
Channelizing Islands, Painted Medians, Paved Shoulders,
and Approaches to Obstructions
ALASKA 18 in. wide. The spacing of diagonal lines on paved shoul-
ders and in painted medians can vary from 10 to 40 ft based
No diagonal lines are used in painted medians or on paved on the posted speed limit.
shoulders, but 18-in. diagonal lines at 12-ft. spacing are placed
in the median on approaches to obstructions. The edge lines surrounding right-turn channelizing islands
are 8-in.-wide solid lines. Chevrons or cross-hatching lines
Right-turn channelizing islands are outlined by 8-in. lines, that are 18 in. wide and are spaced at 10-ft intervals are used
and 18-in. white chevrons at 7-ft. spacing are used within throughout the paved portion of the right-turn island.
right-turn channelizing islands.
GEORGIA
ARIZONA
Diagonal lines in painted medians are 24 in. wide at 15-ft
No diagonal lines are used in painted medians. spacing.
ARKANSAS Diagonal lines on paved shoulders are 24 in. wide at 15-
to 50-ft spacing.
Right-turn channelizing islands are outlined by 8-in. lines.
No diagonal lines are used. Chevron markings in channelizing islands are 24 in. wide
at 15-ft spacing. The solid lines forming the island are 8 in.
CALIFORNIA wide.
The diagonal lines or chevron markings are normally 12 in. The spacing of 12-in.-wide diagonal lines or chevrons on
wide. The spacing between diagonal lines or chevron mark- approaches to obstacles is 5 ft.
ings may vary from 12 in. in a pedestrian crosswalk to 200 ft
for vehicular traffic. HAWAII
COLORADO
Diagonal lines in painted medians are 12 in. wide at a typi-
cal spacing of 20 ft.
Diagonal lines or chevron markings are 8 in. wide at 25-ft
spacing. The spacing of diagonal lines on paved shoulders Diagonal lines on paved shoulders are 12 in. wide at a typ-
can vary from 20 ft to 100 ft. ical spacing of 40 ft.
Diagonal lines on paved shoulders and in painted medians Chevron markings in channelizing islands are 12 in. wide
are optional. at a typical spacing of 20 ft. The solid lines forming the island
are 8 in. wide.
Painted right-turn channelizing islands are formed with
8-in.-wide solid lines with no markings within the island. IDAHO
Raised right-turn channelizing islands are marked by 8-in.- Diagonal or chevron markings should not be placed as a stan-
wide solid lines on both sides of the gore area leading up to dard practice because of the questionable benefits and high
the island, and along the left edge line of the right-turn lane exposure of paint crews to traffic. Exceptions should be lim-
from the point where the island ends to the point where the ited to those locations where the additional emphasis is clearly
line intersects the right edge line of the intersecting roadway. needed and then only for those with widths of 10 ft or more.
The rest of the raised island is surrounded by 4-in.-wide edge
lines. There are no markings between the raised island and ILLINOIS
the 4-in.-wide edge lines or 8-in.-wide solid lines.
The spacing of diagonal lines used on paved shoulders and in
FLORIDA painted medians between intersections should be 50 ft when
the speed limit is less than 30 mph, 75 ft when the speed limit
Diagonal lines are optional on paved shoulders. Diagonal is 30 to 45 mph, and 150 ft when the speed limit is more than
lines are required in painted medians. The diagonal lines are 45 mph.

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The spacing of diagonal lines used in painted medians near wide when the speed is more than 45 mph and that are spaced
intersections and in pavement width transition markings should at 20-ft intervals are used throughout the paved portion of the
be 15 ft when the speed limit is less than 30 mph, 20 ft when right-turn island.
the speed limit is 30 to 45 mph, and 30 ft when the speed limit
is more than 45 mph. Solid 12-in.-wide lane lines are used to form a painted
island on approaches to raised islands or other obstacles
The spacing of diagonal lines used on approaches to (where traffic flows in the same direction on either side of the
obstructions and in islands for channelized turns should be island). Chevrons that are 6 in. wide when the speed is 45 mph
10 ft when the speed limit is less than 30 mph, 15 ft when the or less or 12 in. wide when the speed is more than 45 mph are
speed limit is 30 to 45 mph, and 20 ft when the speed limit is spaced at 20-ft intervals within the painted island.
more than 45 mph.
Diagonal lines are optional in painted medians. If used,
In all of these cases, if the recommended spacing does not the diagonal lines are 6 in. wide when the posted speed limit
provide at least five 12-in.-wide diagonal lines in the area is 45 mph or less or 12 in. wide when the posted speed limit
being marked, the spacing from the next lowest speed range is more than 45 mph. The spacing of diagonal lines on paved
should be used. shoulders and in painted medians can vary from 10 to 40 ft
based on the posted speed limit.
INDIANA Two sets of 4-in.-wide double yellow centerlines are used
to form a painted island on approaches to raised medians or
When the posted speed limit is 45 mph or less, the spacing of
other obstacles (where traffic flows in the opposite direction
12-in.-wide diagonal lines used in painted medians should be
on either side of the island). Diagonal lines that are 6 in.
20 ft. When the posted speed limit is more than 45 mph, the
wide when the posted speed limit is 40 mph or less or 12 in.
spacing of 24-in.-wide diagonal lines used in painted medi-
wide when the posted speed limit is more than 40 mph are
ans should be 40 ft.
placed within the painted island. The spacing of the diagonal
lines can vary from 10 to 40 ft based on the posted speed limit.
The edge lines surrounding right-turn channelizing islands
are 8-in.-wide solid lines. Diagonal lines that are 12 in. wide
and are spaced at 20-ft intervals are used throughout the MINNESOTA
paved portion of the right-turn island.
Diagonal lines in painted medians are 24 in. wide at 20-ft
spacing (measured perpendicular to the diagonal lines instead
IOWA of along the lane line). For speeds less than 40 mph, the diag-
onal lines may be reduced to 12 in. in width. For speeds more
The spacing of 8-in.-wide diagonal lines used in painted
than 40 mph, the spacing may be increased to 30 ft.
medians and channelizing islands is 20 ft. If the width of the
painted median becomes less than 2 ft, the median is painted
solid yellow. The lines outlining the painted median or chan- MISSISSIPPI
nelizing island are also 8 in. wide.
Diagonal lines in painted medians are 18 in. wide at 20-ft
spacing. The lines surrounding the painted median are 12-in.-
KANSAS
wide solid lines.
Diagonal and chevron lines are 12 in. wide, are inclined at a
Diagonal lines on paved shoulders are 18 in. wide at 20-ft
30° angle, and are spaced at a distance in feet equal to the
spacing.
speed in mph.
MONTANA
LOUISIANA
The edge lines surrounding right-turn channelizing islands
Diagonal lines in painted medians are 24 in. wide at 24-ft
are 8-in.-wide solid white lines. Chevrons or cross-hatching
spacing.
lines are not used on the paved portion between the edge lines
and the raised island. The curbs of the raised right-turn chan-
MICHIGAN nelizing islands are painted yellow.
The edge lines surrounding right-turn channelizing islands Diagonal lines in painted medians are 24 in. wide, are in-
are 6-in.-wide solid lines. Chevrons or cross-hatching lines clined at a 30° angle, and are spaced at 25-ft (shown as 7.5-m)
that are 6 in. wide when the speed is 45 mph or less or 12 in. intervals.

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NEBRASKA are not used on the paved portion between the edge lines and
the raised island. Chevrons that are 8 in. wide at 10-ft spacing
Diagonal lines in painted medians are 12 in. wide. The spac- are used in painted right-turn channelizing islands.
ing of diagonal lines on painted medians is 12 ft in urban
areas and 20 ft in rural areas. Diagonal lines in painted medians are 8 in. wide and are
spaced at 15-ft intervals.
NEW HAMPSHIRE
OREGON
Diagonal lines are optional on paved shoulders and in painted
medians. If used, the diagonal lines are 24 in. wide. The spac- Diagonal lines are optional in painted medians. If used, the
ing of diagonal lines on paved shoulders and in painted medi- diagonal lines are 12 in. wide and are placed at a 36° angle
ans is 20 ft. to the lane line. The spacing of diagonal lines in painted
medians is 20 ft; however, a 40-ft spacing may be used when
the distance between left-turn lanes exceeds 200 ft. The diag-
NEW YORK
onal lines are rectangular in shape and do not connect to the
Diagonal lines in painted medians are usually 24 in. wide at lane lines. The nearest points of the diagonal lines are placed
11-ft (shown as 3.3-m) spacing. However, two other patterns 4 in. from the centerline.
of diagonal lines are also available to the designer. The diag-
onal lines may be 8 in. wide at a 15° angle at 10-ft (shown as Chevrons or cross-hatching lines are optional in right-turn
3.0-m) spacing or may be 12 in. wide at a 20° angle at 12-ft channelizing islands.
(shown as 3.6-m) spacing. The 15° and 20° angles are mea-
sured from the centerline.
PENNSYLVANIA
Diagonal lines on paved shoulders are usually 24 in. wide Diagonal lines are used in painted medians only when re-
at a maximum spacing of 100 ft. However, two other patterns quired to provide emphasis if the visibility or sight distance
of diagonal lines are also available to the designer. The diag- is restricted. If used, the diagonal lines are 24 in. wide and
onal lines may be 8 in. wide at a 15° angle at 10-ft (shown as are spaced at 8-ft intervals when speeds are 35 mph or less
3.0-m) spacing or may be 12 in. wide at a 20° angle at 12-ft and at 16-ft intervals when speeds are more than 35 mph.
(shown as 3.6-m) spacing. The 15° and 20° angles are mea-
sured from the edge line.
Diagonal lines on shoulders are 24 in. wide and are spaced
at intervals equal in feet to the posted speed limit in miles per
NORTH CAROLINA hour. The spacing may be increased to 200 ft or more on
Interstate highways.
The spacing of 8-in.-wide diagonal lines or chevrons used in
painted medians and channelizing islands is typically equal in The edge lines surrounding raised right-turn channelizing
feet to the posted speed limit in mph. The spacing of the diag- islands are 4-in.-wide solid white lines. Chevrons or cross-
onal lines can be increased to 200 ft or more on shoulders of hatching lines are not used on the paved portion between the
Interstate roadways. edge lines and the raised island.
OHIO RHODE ISLAND
Diagonal lines and chevrons that are 24 in. wide are used on Diagonal lines and chevrons are 12 in. wide. Diagonal lines
shoulders, in painted medians that are more than 6 ft wide, in painted medians are spaced at 10-ft intervals.
and in islands. Diagonal lines may be used, but are typically
not used if the painted median is 6 ft or less in width. The
spacing of the diagonal lines or chevrons is 12-ft for the first SOUTH CAROLINA
48 ft, 24 ft for the next 48 ft, and 48 ft thereafter. If a painted
Chevron markings in islands separating traffic moving in the
median separates opposing directions of traffic, the 12-ft spac-
same direction are 24 in. wide at 6-ft spacing.
ing starts on both ends of the painted median.
Diagonal lines in painted medians are 24 in. wide. The di-
OKLAHOMA agonal lines begin when the median width reaches 2 ft. The
first five diagonal lines are spaced at 6-ft intervals, the next
The edge lines surrounding right-turn channelizing islands are four diagonal lines are spaced at 12-ft intervals, and the
8-in.-wide solid white lines. Chevrons or cross-hatching lines remaining diagonal lines are spaced at 18-ft intervals. The

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diagonal lines end when the median width reaches 8 ft; how- The edge lines surrounding raised right-turn channelizing
ever, the length of median with diagonal lines spaced at 18-ft islands are 8-in.-wide solid white lines. Chevrons that are 8 in.
intervals is not less than 72 ft or more than 500 ft. wide at 10-ft spacing are placed in the painted island area
before the raised portion of the island and in the painted
island area after the raised portion of the island.
SOUTH DAKOTA
Diagonal lines in painted medians are 24 in. wide and are typ- VERMONT
ically spaced at 25-ft intervals. Diagonal lines in painted
medians in the transition from two-lane highways to four-lane Diagonal lines in painted medians are 8 in. wide. Diagonal lines
divided highways are 24 in. wide and are spaced at 20-ft are spaced at 7-ft intervals where speeds are low, where sight
intervals. distance is less than 200 ft, and where the length of the painted
median is 75 ft or less. Diagonal lines are spaced at 14-ft inter-
vals where speeds are high and sight distance is 200 ft or more,
TENNESSEE and where the length of the painted median is more than 75 ft.
Diagonal lines and chevrons are 12 in. wide. Painted medians and islands that are 4 ft or less in width and
triangular islands that have an area of less than 450 ft2 are
Diagonal lines in painted medians that are at least 6 ft painted in their entirety. The edge lines surrounding triangular
wide and on shoulders are spaced at 50-ft intervals when the islands that have an area of 450 ft2 or more are 48-in.-wide solid
posted speed limit is 40 mph or less and 100-ft intervals when white lines, and chevrons or cross-hatching lines are not used.
the posted speed limit is 45 mph or more.
WEST VIRGINIA
Diagonal lines and chevrons on approaches to obstruc-
tions are spaced at 10-ft intervals when the posted speed limit Diagonal lines in painted medians are 12 in. wide and are
is 40 mph or less and 20-ft intervals when the posted speed spaced at 12-ft intervals.
limit is 45 mph or more.
The edge lines surrounding painted islands are 6- to 8-in.-
Diagonal lines in painted medians where a left-turn lane wide solid lines. Chevrons or diagonal lines that are 12 in.
is formed by roadway widening at an intersection are spaced wide at 6-ft spacing are used in painted islands.
at 10-ft intervals and start when the width of the median
becomes 6 ft.
WISCONSIN
The edge lines surrounding right-turn channelizing islands Diagonal lines in painted medians are 12 in. wide and are
that have an area of less than 400 ft2 or less are 8-in.-wide typically spaced at 25-ft intervals. Diagonal lines begin when
solid white lines. Chevrons that are 12 in. wide at 10-ft spac- the painted median becomes 3 ft wide.
ing are placed inside the island.
The edge lines on the approaches to raised islands are 8-in.-
The edge lines surrounding right-turn channelizing islands wide solid lines that extend 5 ft beyond the nose of the island.
that have an area of 400 ft2 or less are 24-in.-wide solid white
lines. Chevrons or cross-hatching lines are not used.
WYOMING
The edge lines surrounding raised right-turn channelizing
The edge lines surrounding painted islands are 8-in.-wide
islands are 8-in.-wide solid white lines. Diagonal lines that
solid white lines. Chevrons or diagonal lines are not used in
are 12 in. wide at 10-ft spacing are placed in the paved por- painted islands.
tion between the edge lines and the raised island if the width
of the paved portion is at least 6 ft.
DISTRICT OF COLUMBIA
TEXAS Diagonal lines or chevrons in painted medians, gore areas,
channelizing islands, shoulders, and approaches to obstruc-
Diagonal lines in painted medians are typically 24 in. wide, tions are 12 in. wide and are spaced at 5-ft intervals.
but no less than 12 in. wide, and are spaced at 20-ft intervals.
PUERTO RICO
UTAH
Diagonal lines are optional on shoulders and are 12-in. lines
Diagonal lines are optional in painted medians. If used, the spaced at 33-ft intervals. Diagonal lines are not used in painted
diagonal lines are 8 in. wide and are spaced at 10-ft intervals. medians.

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CHARLOTTE, NC 24 in. wide when the speed limit is 45 mph or more. Diag-
onal lines or chevrons in painted medians or islands are
Diagonal lines or chevrons on shoulders, painted medians, spaced at 20-ft intervals when the speed limit is 40 mph or
and painted islands are 12 in. wide, are inclined at a 30° angle less and at 80-ft intervals when the speed limit is 45 mph
from the lane line, and are spaced at 30-ft intervals. or more.
NEW YORK, NY No standards were found for:
Diagonal lines on shoulders are 16-in. lines spaced at unspec- Alabama Nevada
ified intervals. Connecticut New Jersey
Delaware New Mexico
Kentucky North Dakota
TUCSON/PIMA COUNTY, AZ Maine Virginia
Maryland Washington
Diagonal lines or chevrons in painted medians or islands Massachusetts Los Angeles, CA
are 12 in. wide when the speed limit is 40 mph or less and Missouri