1. 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

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

3. 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

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

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

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

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8. 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-1981624 SLO-1311

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

11. Additional Surveys 11 Group Section # Rider # Mon-1981624 SLO-1311 Davis46 Santa Rosa626 Tahoe416 Chico Velo58 Alto Velo416

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13. 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. 14 http://www.ucprc.ucdavis.edu/PDF/UCPRC-TM-2013-07.pdf Final report, including results of additional survey sections, to be completed in December, publish in February.

15. 15 John Harvey, jtharvey@ucdavis.edujtharvey@ucdavis.edu Hui Li, hili@ucdavis.eduhili@ucdavis.edu