T3 Webinar September 2012 Performance Measures Edward J. Smaglik September 18 th, 2012.

T3 WebinarSeptember 2012

Performance Measures

Edward J. SmaglikSeptember 18th, 2012


Green Occupancy Ratio (GOR) and Arrival Type (AT)

Data requirementsTheoryPerformance data Signal Performance Progression Performance


Data Requirement

Event based data (0.1 second resolution) Controller or other data collection

device

Phase and detector status GOR: Phase, stopbar presence AT: Phase, advance count (presence

can be used)


Average = 53.333%

Why event based data?

Aggregation removes fidelityAggregation typically based upon minutes Does not align with cycles

Green

Percent Arrival on Green

60%

Green 20%

Green 80%

C1

C2

C3


Green Occupancy Ratio

where Og = Occupancy of a green interval

i Ld = Length of detection zone Lc = Length of vehicle

i

g

g

OGOR

tg

DetectionZone

th

Lc

Vc

Lc Ld

n

i ci

dcig V

LLO

1

)(

Vc = Velocity of vehicle tg = time gap between vehicles th = time headway

between vehicles



Measure of signal performance Higher volume, less detector off time,

higher metric value Metric value dependent on vehicle

speed and detection zone length Lower speeds => Higher metric valueShorter detection zone => Lower metric

value



Comparison to V/C, with different detection zone lengths

20.1m detection zoneGOR

11m detectionzone GOR

Phase 8 V/CRatio

V/C and Green Utilization Ratio, 20 pt moving average,Phase 8, Noblesville, November 10th, 2006

0

0.5

1

1.5

12:00 AM 6:00 AM 12:00 PM 6:00 PM 12:00 AM

Time of Day

MO

EMO

E


Arrival Type

Measure of progression performanceWell known Highway Capacity Manual concept Value has impact on delay calculation Value can be developed

QualitativelyQuantitatively


Arrival Type - Qualitative

Exhibit 10-18, HCM 2000


Arrival Type - Quantitative

g

CPRp

Arrival Type Range of Platoon

Ratio (Rp)

Default Value

(Rp)

Progression

Quality

1 0.50 0.333 Very poor

2 > 0.50 – 0.85 0.667 Unfavorable

3 > 0.85 – 1.15 1.000 Random arrivals

4 > 1.15 – 1.50 1.333 Favorable

5 > 1.50 – 2.00 1.667 Highly favorable

6 > 2.00 2.000 Exceptional

Rp = Platoon RatioP = Percent of Vehicle Arriving on GreenC = Cycle LengthG = Length of green interval

Green Green

g

C NgNr

Percent arrivals on green (5 cycle moving average), Northbound approach Phase 2, Noblesville, 08/09/2005

0%

20%

40%

60%

80%

100%

0:00 6:00 12:00 18:00 0:00

Time of Day

Per

cen

t ar

riva

ls o

n g

reen

AM Off-Peak

Mid-day

Off-peak

PM Off-peak

FreeFree

10045536983

1044153627

g

CPRpArrival Type Sample Data


Arrival Type (20 cycle moving average), Northbound approach Phase 6, Noblesville, 07/25/2006ASC/3 Data

0

1

2

3

4

5

6

0:00 6:00 12:00 18:00 0:00

Time of Day

Arr

ival

Typ

e

Arrival Type Lane A Lane B Lane C Estimated Continuous Arrival Type

AM Off-Peak

Mid-day

PM Off-peak

FreeFree Off-Peak

g

CPRp

Progression

Quality

Very poor

Unfavorable

Random arrivals

Favorable

Highly favorable

Exceptional

Progression

Quality

Very poor

Unfavorable

Random arrivals

Favorable

Highly favorable

Exceptional

Progression

Quality

Very poor

Unfavorable

Random arrivals

Favorable

Highly favorable

Exceptional

Arrival Type Sample Data


City of Mesa test intersection

E. Southern Rd & S. Power Ave located on the east side of MesaGeography Adjacent to Shopping Mall and

Retirement Community ½ mi north of US 60 Wide Streets

Adaptive control system location


Generic Data Collection Diagram

Coax cablefrom camera

8 inputs LT green Th green

6 auxiliary for detector monitoring

24V signal orload switch

Loop detectorrack outputs

Overlay

Data fileCoax Cable from camera

Phase Status SDLC Bus

Detection Device Status

(Loop or other)

TS1 Contact Closure Inputs (16)

DataCollection

Device


4

3

2

1

LegendVideo / Data Collection Camera6x6 Inductive Loop DetectorCamera Number

N

Data collection instrumentation plan

E. Southern Ave. & S. Power Rd, Mesa AZ

Notes· This plan is not drawn to scale.· 6x6 loops are located about 400' back from the stop bar

in each through lane, each on a separate channel.· 6x6 loops are located at the stopbar for each individual

lane, each on its own channel, with the exception of loops in dual left turn bays, which share a channel.

· Cameras 1-4 are mounted on existing mast arms, located transversely at a point between the oncoming through and left turn lanes.

4


What do I need?

Event based data logger Adaptive system Available on certain:

Traffic controllersVideo detection devices

Standalone device

Access to detector and phase state changes on 0.1s resolution

T3 Webinar September 2012 Performance Measures Edward J. Smaglik September 18 th, 2012.

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