Transcript Office of Traffic, Safety, and Operations Application Guidelines Warning Signs Signing Plan Design (At-Grade) June 20, 2012

Office of Traffic, Safety, and Operations
Application Guidelines
Warning Signs
Signing Plan Design (At-Grade)
June 20, 2012
Office of Traffic, Safety, and Operations
Function of Warning Signs
 MN MUTCD 2C.1
– Call attention to unexpected conditions or
situations not readily apparent to road
users
– Alert road users to conditions that might
call for a reduction in speed or an action in
the interest of safe and efficient operation
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Office of Traffic, Safety, and Operations
Placement of Warning Signs
 MN MUTCD 2C.5
– The time needed to complete a reaction to
a sign is the sum of time for:
•
•
•
•
Perception
Identification (understanding)
Emotion (decision-making)
Volition (execution)
– Table 2C-4 (TEM Chart 6.5) lists suggested
sign placement
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Office of Traffic, Safety, and Operations
Placement of Warning Signs
 MN MUTCD Table 2C-4
 TEM Chart 6.5
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Office of Traffic, Safety, and Operations
Placement of Warning Signs
 MN MUTCD 2C.5
– Distances in Table 2C-4 are for guidance
and should be applied with engineering
judgment
– Signs should not be placed too far in
advance of the condition, such that drivers
will forget, especially in urban areas
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Office of Traffic, Safety, and Operations
6-6.03 Advance Warning Signs on
Local Road Approaches
 STOP AHEAD
 YIELD AHEAD
 SIGNAL AHEAD
– Place using Chart 6.5
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Office of Traffic, Safety, and Operations
6-6.03 Advance Warning Signs on
Local Road Approaches
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Office of Traffic, Safety, and Operations
6-6.03 Advance Warning Signs on
Local Road Approaches
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Office of Traffic, Safety, and Operations
6-6.07 Chevron Alignment Signs
– The Chevron Alignment sign is a warning
sign and, as with all warning signs, should
be used sparingly, as excessive use will
reduce its effectiveness.
– Generally, this sign should be used only on 6
degree curves or greater. Curves of less
than 6 degrees would be marked by
standard delineation as covered in Chapter 7
(not covered in this class)
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Office of Traffic, Safety, and Operations
6-6.07 Chevron Alignment Signs
– Spacing is based on speed, grade, super
elevation, visibility, and vertical alignment
• See Chart 6.6
– Classification of the road governs sign size
• trunk highways – 18” x 24”
– 24” x 30” may be used based on engineering judgment
• Expressways – 30” x 36”
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Office of Traffic, Safety, and Operations
6-6.07 Chevron Alignment Signs
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Office of Traffic, Safety, and Operations
6-6.09 Crossing Signs
– Non-vehicular (ped, trail, deer) and
vehicular (snowmobile) crossing signs
should only be used at locations
• where the condition, crossing activity, or shared
use of the roadway is unexpected
• Where a sight restriction exists
• Where a geometric constraint exists
– Crossing signs shall be placed in accordance
with the MN MUTCD Table 2C-4 (Chart 6.5)
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Office of Traffic, Safety, and Operations
6-6.09 Crossing Signs
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Office of Traffic, Safety, and Operations
6-6.09 Crossing Signs
Non-Vehicular Signs
– Pedestrian Crossing Signs
• Typical Applications
– Isolated intersections with heavy ped volumes
– Ped crossings where approach visibility is poor
– Mid-block crossings
• Special treatment not usually required at normal
intersections within municipalities or rural ints.
– In urban areas, the distance for the sign may be less
where lateral clearnace is limited or where inadequate
spacing exists
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Office of Traffic, Safety, and Operations
6-6.09 Crossing Signs
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Office of Traffic, Safety, and Operations
6-6.09 Crossing Signs
In-Street Ped Crossing Signs
– Used to remind road users of the
state law that requires a vehicle to
stop and yield the right of way to a
ped crossing the roadway with a
marked or unmarked crosswalk
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Office of Traffic, Safety, and Operations
6-6.09 Crossing Signs
In-Street Ped Crossing Signs
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–
Guidelines for use on state highways
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Shall be permitted thru MnDOT district offices
Shall be used speed zones of 35 mph or less
Only one sign structure shall be used per approach near marked crosswalks
Shall not be used at intersections controlled by traffic signals or on approaches
controlled by STOP signs
Should only be used at key locations (high volume)
Shall only be used as an in-street sign (not on the shoulder or parking lane).
Shall not impede or obstruct through or turning traffic movements
When sign is used at a school crossing, it shall include a SCHOOL plaque
The STOP FOR legend shall be used as Minnesota state law and specifically
requires a driver to stop for a ped in the crosswalk
Shall have a black legend and border on white and fluor. Yellow-green
background and have dimensios shown on standard sign R1-6b
Shall have the same message on both sides or a reflective stip mounted on the
backside which is the same color as the lane line on which it is mounted. Backto-back signs should only be used on two-lane, two-way roadways (see MN
MUTCD Figure 2B-2).
Shall meet the crashworthiness requirements of NCHRP Report 350
Max mounting height shall be two feet to bottom or sign panel.
May be used seasonally to prevent damage in winter due to plowing ops, and
may be removed at night if activity is minimal
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Office of Traffic, Safety, and Operations
6-6.09 Crossing Signs
 In-Street Ped Crossing Signs
– MN MUTCD Figure 2B-2
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Office of Traffic, Safety, and Operations
6-6.09 Crossing Signs
 In-Street Ped Crossing Signs
– MN MUTCD Figure 2B-2
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Office of Traffic, Safety, and Operations
6-6.09 Crossing Signs
 In-Street Ped Crossing Signs
– MN MUTCD Figure 2B-2
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Office of Traffic, Safety, and Operations
6-6.09 Crossing Signs
 In-Street Ped Crossing Signs
– MN MUTCD Figure 2B-2
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Office of Traffic, Safety, and Operations
6-6.09 Crossing Signs
Trail Crossing Signs
– Should only be installed for officially
designated trails which cross the highway
and are not continuously visible for a
distance of 850 feet from the crossing
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Office of Traffic, Safety, and Operations
6-6.12 No Passing Zones
 No Passing Zone Signs
– Size – 48” x 60” x 60”
Terminal Marker Posts
– A yellow post may be used to mark each
terminal end of a No Passing Zone
– A yellow, 360° visibility enhancer shall be
mounted on the top of each marker post
– A 3.5” x 2” sticker stating “MnDOT No
Passing Zone Terminal Marker” shall be
installed near the top of each enhancer
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Office of Traffic, Safety, and Operations
6-6.16 Speed Reduction Sign
– 48” x 48”
– Shall be used if the reduction in speed limit between
zones is 15 mph or greater
• For difference in zones of 10 mph or less, use engineering
judgment
– Shall be installed 1000’ in advance of first speed
limit sign
• May be installed up to 1700’ in advance due to geometrics,
grade, or sign clutter
– A two-line distance plaque may be used
– In-place speed reduction signs shall be replaced
through attrition
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Office of Traffic, Safety, and Operations
Typical Signing
6-6.18 Typical Signing for
Transitions between Divided
Highway Section and Two-Lane,
Two-Way Section
– Figure 6.23
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Office of Traffic, Safety, and Operations
Typical Signing
6-6.06 Channelized Intersections
– Figure 6.20A – Raised Median
– Figure 6.20B – Painted Median
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Office of Traffic, Safety, and Operations
Typical Signing
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