City of Houston Street Surface Assessment Vehicle

Presented to the Flooding & Drainage Committee

Eric K. Dargan – Deputy Director

Pavement Assessments for Roadways in the City of Houston

• Pavement Condition Rating (PCR)

• Usage of PCR scores

• 1999-2001 IMMP (Infrastructure Maintenance Management Program)

Typical Roadway Problems

ALLIGATOR CRACKING

TRANSVERSE CRACKING

RAVELLING

RUTTING

Typical Roadway Problems

LONGITUDINAL CRACKING

JOINT SEAL

CONCRETE CRACKS

SLAB REPLACEMENT

IMMP

• IMMP program – Evaluated by individuals

• IMMP PCR Score Factors:

• Flushing• Surface Deterioration• Faulting• Slab cracking*• Slab Replacements*• Ride Condition

(*concrete only)

• Rutting • Raveling• Alligator Cracking• Transverse Cracking• Longitudinal Cracking• Joint Seal Present• Patching

Overview of the Street Surface Assessment Vehicle (SSAV)

• Procured from Idea Integration, Inc. in August 2008

• Data testing began July 2009

• Full production began May 2010

• Assessments are anticipated to occur every 2-3 years

• Estimated 5-year system life = 3 Assessments

Assessment Costs

• Contract rate per assessment - $1.7M (no video)

• PWE Annual Total Operational Cost - $590k (includes video collection)

• 3 Assessments over 5 years = $5.21M contract cost vs. $2.95M internal costs

• Possible future partnerships with other area agencies may recoup some costs

Technical Components of the Street Surface Assessment Vehicle

CrackScope 360 degree camera

GPS Unit

Road Profiler

Distance Measuring Instrument

SSAV Capabilities

• Assesses asphalt/concrete roads in clear weather

• Measures distance traveled only (center-line miles)

• Does not currently identify or “asset tag” any items

• Program relies on machines and specific software to create a more consistent PCR score

• For a road section, 100 is the starting value. Three reductions bring the PCR to its final number. – IRI or ‘roughness’ deduction

– Rutting deduction

– Cracking deduction

What Happens Next?

• Upcoming Completion Schedule– 11/30/2010 – 56%

– 12/31/2010 – 62%

– 03/30/2011 – 82%

– 06/30/2011 – 100%

• Video capture is being used for identification of key items

• Actual completion time depends on the ability for the van to be on the road

How Will We Use This Data?

• To guide and expand maintenance programs– Overlay program– Concrete repairs

• Primary factor for development and scheduling capital projects for streets

Council Districts & SSAV Data

COUNCIL DISTRICT

TOTAL SSAV MILES COMPLETE

A 413B 533C 178D 346E 724F 52G 208H 656I 471

20 Worst Scored Thoroughfare Street Sections in the City

Key Map

Council District

Street Name From Block

To Block

Potholes Observed

Overall PCR Score

Miles Driven

492M G SHEPHERD DR 300 1399 52 50.607 0.503453P, T, X H AIRLINE DR 1700 2999 76 50.63 1.821535F, K I BROADWAY ST 1900 2699 31 50.71 1.044494N H SAMPSON ST 100 1099 37 52.06 0.606493L I PRAIRIE ST 700 1299 4 53.26 0.27494N H N SAMPSON ST 1 299 22 53.46 0.278

576K,L,P E S SHAVER ST 4900 4905 27 54.07 1.062493V, U I DOWLING ST 1950 2599 49 54.2 0.61

452X A ELLA BLVD 1700 1999 16 54.26 0.317493H, 494H B LORRAINE ST 2000 2849 15 54.41 0.349

494C, D B, H WALLISVILLE RD 5600 6499 70 54.58 1.225533D D CULLEN BLVD 3534 3899 56 54.82 0.63492Y D S SHEPHERD DR 3600 3999 5 55.12 0.28

532K, P C BUFFALO SPDWY 7900 9499 29 55.13 1.767532K,L,N,P C S BRAESWOOD BLVD 2490 4199 144 55.2 3.424

493T, X D, I ALABAMA ST 900 1499 15 55.59 0.803534L I S WAYSIDE DR 3800 4999 15 55.76 0.55493J D W DALLAS ST 2400 2909 6 55.98 0.258616B E HUGHES RD 10418 11175 11 56 1.391

453Z, 454W H COLLINGSWORTH ST 1700 2799 18 56.86 0.048

Questions?