ST9905-CS060118I~uzan Taylor - Re: Bethel Road I traffic signal
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Per Birdsall
Suzan Taylor
1/18/2006 8:52:28 AM
Re: Bethel Road I traffic signal
Page 1 !
Sorry I haven't been able to respond to this sooner. My mother died of Breast Cancer on the 3rd. If
decisions have already been made, I am agreeable to them. Per
>>> Suzan Taylor 01/03/06 8:15 AM >>>
Per:
Transystems has a few more questions about the traffic signal. I sent them the traffic signal plans from
the W. Sandy Lake plans prepared by TNP to use as an example. If you need a copy in order to
understand his question, please let me know.
Thanks
1. If you use a 10:1 distance to height ratio for camera mounting, I don't
think advance detection will be achievable with the cameras on the mast
arms. We do not currently show luminaires on the mast arms.
RESPONSE: Advanced detection, in my opinion, is not a critical issue at this time. Luminaires on the
traffic masts, to the best of my knowledge, are not being considered in the lighting scheme. Typically
lighting has been provided in the roadway improvements-in the median. Do we have lighting in the works
for Bethel Rd. Improvements? Extensions of the signal masts might facilitate advanced detection without
additional cameras and provide a better "line of sight" for wireless communications.
2. Also, in looking at the example plans do you typically use a side
mounted signal head (on the mast arm pole) for each approach?) How
about a near side head (only if mast arm >180 feet from stop line)?
RESPONSE: Side mounted signal heads have only been used for intemections with a dedicated right turn
bay in Coppell. Near side heads I believe have only been applied at offset intersections and intersections
occurring in a horizontal curve. We have not had a distance exceeding the >180 feet.
3. Do you want pedestrian indications at the intersections? All four legs?
RESPONSE: YES
4. Do you need the phasing diagram and signal heads display chart as shown
on the example plans? Do you have an example of how you show the
phasing diagram for 8 phase (the example had sequential phasing - with 8
phase we will have 1+5 to 2+5 OR 1+6 then to 2+6, do you branch the
diagram and then show clearance for each?).
RESPONSE: An example of an 8 phase would be on the plans for Fairway or Natches Trace.