Hui Li, Ph.D. UC Pavement Research Center (UCPRC) University of California, Davis & Berkeley Nov 12 th, 2013 1 SLO County Bike Advisory Committee Meeting.

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Presentation transcript:

Hui Li, Ph.D. UC Pavement Research Center (UCPRC) University of California, Davis & Berkeley Nov 12 th, SLO County Bike Advisory Committee Meeting

Outline Macrotexture Measurement Bicycle Vibration Measurement Survey on Bicyclist Ride Quality Additional Survey Remedial Treatment on SLO-1 Remarks 2

Macrotexture Measurement 3 Laser Texture Scanner (LTS) Spot block measurement with need for traffic closure Inertial Profiler (IP) Continuous linear measurement without need for traffic closure Mean Profile Depth (MPD) Unit: mm or in

MPD (example): Continuous measurement w/ IP 4 HMA Bridge

5 Sand Seal Chip Seal On Mon-198 Chip Seal On SLO-1

Bicycle Vibration Measurement 6 Accelerometers (solid red circles) GPS unit (dot blue circle)

7

Bicyclist Survey Acceptability (0 = Unacceptable; 1 = Acceptable): average rate of acceptability or percentage of riders rating pavements as “Acceptable”. Ride Quality: 1 to 5, with 1 = Poor and 5 = Excellent. Other background information with potential correlations. 8 GroupSection #Rider # Mon SLO-1311

9

Remedial Treatment on SLO-1 10 Preliminary measurement just after construction of short test sections of sand seal

Additional Surveys 11 Group Section # Rider # Mon SLO-1311 Davis46 Santa Rosa626 Tahoe416 Chico Velo58 Alto Velo416

12

Remarks From preliminary results, 80% riders rate pavements with 2.0 mm MPD as acceptable; 50% for 2.5 mm. Sand seal reduces the macrotexture (MPD) of the chip seal on SLO-1. The final reduction will be measured after completing construction and opening to traffic for a while. Beside MPD (macrotexture), IRI (roughness/unevenness) may also influence the bicyclist ride quality. Unmaintained pavement develops greater IRI due to cracking, rutting. Need to consider the balances & tradeoffs: Ride quality (smoothness) and ride safety (skidding resistance) Vehicle users and bicycle users (different needs) Performance and cost 13

14 Final report, including results of additional survey sections, to be completed in December, publish in February.

15 John Harvey, Hui Li,