The 2011 MUTCD, Left Turn Signal Operations and Flashing ...2009 MUTCD (Final Rule) D Section 4D.11 – Recommended number, location, and design of signal faces for approaches with

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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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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Section 4D.11 – Recommended

minimum number of thru signal faces

on approaches with speeds > 45 mph:

Left Turn Signal Faces

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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

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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)

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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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