7. Appendix E - 95% Queue Length AnalysisAppendix E
95% Queue Length Analysis
5telling Engineers, 1NC.
Great Falls, Montana 59405
406.452,8600 or mail@stellinginc.com
Job HEA-k 0 t A S-J TLZAf 4) Job#_ J Z- ram« Z,
Sheet No. 1. of z,
Calculated By 7m Date U ! Z
Subject cl 5 "4 &vE uE &Zrl LYS_S Checked By
Date
I �
Step 16; Compute Queue Wiigth`s
Research (3) has determined than the
TWSC intersections can be applied to AV
queue length is cum uted as the product
Flow rate for the movement of intereht.
Equation 20-33 can be used to calcula
approach lane. j
900T
Q95 ~ tx 1} -
where
Qys = 95th percentile queue (veld),
x = vhd/3,600 � degree of utilizatior
hd = departure headway (s), and
i
T = length of analysis period (h).
PEDESTRIAN MODE
Applying the LOS procedures used t,
intersections to AWSC intersections does
The TWSC delay calculations apply only
not STOP -controlled (i.e., pedestrians ?cros;
intersection). Approaches where conpicti
pedestrians crossing the minor streei at a
result in negligible delay for pedestriar s,
wait for conflicting vehicle and pedestrian
As such, applying the TWSC meihod
intersections results in negligible delay fo
reality of AWSC intersection operations fi
however, and generally results in at least
amount of delay incurred will depend on
characteristics of the intersection in quest
accounting for these factors is available, s
discussed qualitatively below.
The operational characteristics of AW
depend on driver behavior. In most cases,
pedestrians crossing or preparing to :cross
should be expected that operationns differ
enforcement levels, region of the country,
rural).
Traffic Volumes
At intersections with relatively I W tr
standing queues of vehicles at AWS ap
attempting to cross an approach,of the int
Chapter 20/AII-Way Stun -Controlled Intersections
December 10-70
� I
aver
95th
—1}2 +
produce ii
xossings i
the major
raffic is n
ucies are
is before
to nedesl
e delay for
amber of of
While no q
-al of the mi
in tersecl
ivers are
ticanvy
location
volumes,
hes. In th
,tion will
Page 20-17
Highway Capacity
queues at
the mean
for each
i delay at TWSC
or usable results.
inflicting traffic is
t a TWSC
'oiled (i.e.,
•e assumed to
-d to stop and
ling.
t AWSC
approaches. The
L different,
xians, The
and geometric
tive methodology
Qrtant factors are
�destrians largely
juired to yield to
However, it
ig on
on, suburban, or
generally no
pedestrians
experience little
Equation
Data collection
needed to deter
Los metkooWc%
AWSC Intersecti
ual 2010
d research are
ine an appropriate
for pedestrians at