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Tony Rome, P.E. | Mike Ross, P.E. City of Overland Park, Kansas

August 26, 2013

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“Keep good roads good”

Separate the engineering from the politics

COE “PAVER” system (since 1984). ◦ Provides PCI – structural condition

◦ Provides condition and treatment history

◦ Models impact of treatments on network

Maintain within budget

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Thoroughfares ◦ Built to high standards

◦ 45 MPH +

◦ ADT > 10,000

Safety Concerns

Impact on Traffic

Leads to the

question…

How to safely rate

thoroughfares? [

[

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• COE PAVER

• Windshield

• Calendar

• Super Van

• Roughness

1970s ◦ World Bank sponsored studies to

determine plans for developing

countries infrastructure

1982 ◦ Brazil correlation experiment

established IRI as consistent method

1986 ◦ Methods to calculate IRI presented

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Roughometer III (ARRB) ◦Used from 2011-Present

◦ Integrated GPS device

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August 19, 2013, 10:30 AM

K:\Operations\Paver\Roughometer\2013 Data\Survey Data\2013-07-19\2013-07-19 14h23m07s Survey.rgd

Distance (mi)2.001.000.00

IRI (i

n/m

i)

680

660

640

620

600

580

560

540

520

500

480

460

440

420

400

380

360

340

320

300

280

260

240

220

200

180

160

140

120

100

80

60

40

20

0

Excellent

Good

Fair

Poor

Bad

Ross/Rome Field Testing ◦Vehicle speed

◦Driver influence

◦Survey Techniques

◦Thresholds

Speed o Minimum > 20 mph

o 25-35 mph most consistent

Driver Impact o < 5% at recommended speeds

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Survey Techniques ◦Lead-in

◦Constant speed (Minimize

braking/acceleration)

◦Avoid valve/manhole lids

◦Drive 500 ft in advance

Observed Range ◦65 (Month old overlay on

Metcalf – 87th to 99th Street)

◦184 (Maintenance required on

Quivira – College to 119th Street)

Data Processing ◦Remove low-speed records

(< 20 mph)

◦ “Clean” data using statistics routine

◦ Import Average IRI into PAVER

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City’s ranking system PCI based ◦ “Keep good streets good”

Structural vs. Ride Quality

Divorce thoroughfares from PCI ◦ “Roughest first”

FHWA (Urban/Rural Interstate 2006)

◦ IRI < 170: Acceptable

◦ IRI < 95: Good/Very Good

Pennsylvania (Non-NHS, ADT > 2000)

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Pavement Serviceability Rating ◦ "The judgment of an observer as to

the current ability of a pavement to

serve the traffic it is meant to serve"

(Highway Research Board, 1962)

PSR vs. IRI ◦Patterson study (1986)

links PSR and IRI

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Over 600 Lane Miles

(Includes Other City)

◦Network Average = 138

◦Range: 65 - 428

Rating Range Percent

Very Good IRI < 82 5%

Good 82 < IRI < 184 83%

Fair/Poor IRI > 184 12%

Maintenance Planning Aids – Point map

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Maintenance Planning Aids – Section Map

Data Collection ◦ Inspect annually at minimum

◦Establish performance curves

◦Adopt GASB 34 standards for

thoroughfares based on

IRI/PSR

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Data Analysis ◦Results shared with maintenance

division for spot repair

◦Results used as tool in annual

maintenance planning

◦ Investigating purchase of full-size

profiler/distress vehicle (SuperVan)

Affordable

Accurate and Repeatable

Objective Measurement

Established World Standard

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