the 2011 mutcd, left turn signal operations and flashing ...2009 mutcd (final rule) d section 4d.11...
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The 2011 MUTCD, Left Turn Signal Operations and Flashing Yellow Arrow
Signal Design and Operation
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Significant Changes
Part 4 – Highway Traffic Signals
http://mutcd.fhwa.dot.gov/ser-Training.htm
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2009 MUTCD (Final Rule)
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Section 4D.11 – Recommended number,
location, and design of signal faces for
approaches with speeds > 45 mph: - Face per thru lane,
overhead, far side,
with backplates
1 or more
supplemental
faces
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2009 MUTCD (Final Rule)
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Section 4D.11 – Recommended
minimum number of thru signal faces
on approaches with speeds > 45 mph:
Left Turn Signal Faces
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2009 MUTCD (Final Rule)
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Sections 4D.17 to 4D.20 –
Signal indications for left turns
• Elimination of provisions that
allowed “Dallas” displays
Shared Left Turn Signal Faces 8
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Separate Left Turn Signal Face 10
Separate Left Turn Signal Faces 11
2009 MUTCD (Final Rule)
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Section 4D.13 – Positioning of
overhead separate signal faces for
turn movements
• If installed overhead for a dedicated turn lane, the separate turn face shall be located over the turn lane (not necessarily centered over the lane)
2009 MUTCD (Final Rule)
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Chapter 4D
Optional use of flashing yellow
arrow for permissive turns
FLASHING YELLOW ARROW
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FYA Sequence: Simultaneous
Leading Protected/Permissive LTs
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FYA Sequence: Simultaneous
Leading Protected/Permissive LTs
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FYA Sequence: Simultaneous
Leading Protected/Permissive LTs
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FYA Sequence: Simultaneous
Leading Protected/Permissive LTs
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FYA Sequence: Simultaneous
Leading Protected/Permissive LTs
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FYA Sequence: Simultaneous
Leading Protected/Permissive LTs
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FYA Sequence: Simultaneous
Leading Protected/Permissive LTs
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FLASHING YELLOW ARROW
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FYA Sequence:
Lagging Permissive/Protected LT when
Opposite Direction Has a Leading LT
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FYA Sequence:
Lagging Permissive/Protected LT when
Opposite Direction Has a Leading LT
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FYA Sequence:
Lagging Permissive/Protected LT when
Opposite Direction Has a Leading LT
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FYA Sequence:
Lagging Permissive/Protected LT when
Opposite Direction Has a Leading LT
FYA Sequence:
Lagging Permissive/Protected LT when
Opposite Direction Has a Leading LT
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FYA Sequence:
Lagging Permissive/Protected LT when
Opposite Direction Has a Leading LT
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FYA Sequence:
Lagging Permissive/Protected LT when
Opposite Direction Has a Leading LT
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Where To Implement
Optional use protected /permissive operation
Currently not for Diamond phasing
Evaluate conditions
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Equipment Issues
Controllers
Monitors
Cabinets
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Conclusion – Questions?
Part 4 Changes
Flashing Yellow Arrow
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