SIGNAL
Signalized Intersection Analysis and Design
SIGNAL is the signal analysis
function in TEAPAC Complete
for performing true-HCM capacity analysis, signal timing and
phasing optimization and design of intersection geometry and
control for as many as 500 intersections at a time. This
comprehensive function considers such broad inputs as lane group
geometry, lane usage, pedestrian and clearance constraints and
multi-phase signal control. The methodology uses the capacity
analysis procedures documented in the 2016 and 2000 Highway Capacity
Manuals from TRB, with a user-specified calibration option. The
user can analyze existing conditions and timings
as well as generate optimum signal timings and phasings. The
optimizer in the program seeks to establish the best attainable
level of service, delay or v/c for critical movements within a
specified range of cycle lengths using the 2016 or 2000 Highway Capacity
Manual methods.
This interactive analysis tool is particularly useful in
developing individual intersection control strategies, controller
requirements and required timings since an entire day's variation
in volumes can be analyzed quickly and accurately. Two-phase,
three-phase, multi-phase, and split-phase control strategies are
considered, with the best phasing being identified for each set
of input data and operational constraints, such as minimum greens
and clearance requirements. The user can easily scan the output
and quickly determine which phasing will handle an adverse
situation most efficiently.
Further, this analysis quickly identifies capacity problems and
points directly to the cause of the problem. At this point,
solutions can be generated to solve the problem in terms of more
sophisticated control strategies, revised lane usage, improved
roadway geometrics, or any combination of the above. These
solutions can be tested quickly under re-optimized conditions. The results of this analysis provide the user with valuable
timing data related to local control for field implementation.
As part of the integrated TEAPAC Complete, SIGNAL does not stand by itself. It can share input and output with other TEAPAC functions, such as TURNS for peak hour count analyses, WARRANTS for signalized intersection warrant analysis, SITE to analyze projected volumes for impact analyses, PREPASSR & PRETRANSYT for signal timing with PASSER-II and TRANSYT-7F, and PRENETSIM for simulation/animation with NETSIM/CORSIM, among others. As such, SIGNAL is the cornerstone application of TEAPAC.
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this page last updated February 04, 2019