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Bicyclist Ride Quality: Preliminary Results

SLO County Bike Advisory Committee Meeting. Bicyclist Ride Quality: Preliminary Results. Hui Li, Ph.D. UC Pavement Research Center (UCPRC) University of California, Davis & Berkeley. Nov 12 th , 2013. Outline. Macrotexture Measurement Bicycle Vibration Measurement

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Bicyclist Ride Quality: Preliminary Results

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

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

  3. Macrotexture Measurement 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 HMA Bridge HMA Bridge

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

  6. Bicycle Vibration Measurement 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. Remedial Treatment on SLO-1 Preliminary measurement just after construction of short test sections of sand seal

  9. Additional Surveys

  10. 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

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

  12. Thanks!Q&A John Harvey, jtharvey@ucdavis.edu Hui Li, hili@ucdavis.edu

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