Design of a signal sequence chart

[EngTech397]

Does anyone know of a standard for developing a sequence chart? I've seen examples that list Phase A,B on the left side and a row of signal head numbers across the top. I've also seen examples of the phase numbers listed down the left column. How should the chart look if you are not using phases 3 and 7?

 

[francesca]

Most state agencies have Traffic Engineering manuals/design guides. You should do it the way the client/reviewing agency expects to see it.

 

[EngTech397]

Tennessee's DOT manual has a diagram for the dual ring quad-left phasing (Figure 4.3). I don't see a signal indication sequence chart.

This is what I'm looking for

Example:
Phase 1 - Signal head 1 is green, all other heads red
Phase 2 - Signal heads 1 and 2 are green, all other heads red
etc.

 

[francesca]

Having designed signals in Tennessee for TDOT, I can tell you that everything you need for TDOT signal design is in their manual. Who are you doing the design for?

 

[teeman]

Most signal plans will have a Phase Timing Chart showing the values to be set in the controller for the phase intervals utilized (minimum, extension, max, yellow,all red, etc.). The chart also shows the signal head display (G,Y,R)associated with each phase interval. The purpose of the Phase Timing Chart is to ensure the correct displays are on and no conflicting signal head displays are on. The exact layout of the chart varies from agency to agency.

The Phase Sequence Diagram is a separate graphic that illustrates the controller ring structure and the phases in each ring.

When the signals are part of a coordinated system we utilize an additional chart for the phase splits, offsets and cycle lengths. Time of day programming changes are listed in a TOD table.

 

[teeman]

I would contact the reviewing agency and request a sample drawing showing the plan layout they would prefer.