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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

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

outline
Outline
  • Macrotexture Measurement
  • Bicycle Vibration Measurement
  • Survey on Bicyclist Ride Quality
  • Additional Survey
  • Remedial Treatment on SLO-1
  • Remarks
macrotexture measurement
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
slide5

Chip Seal

On SLO-1

Sand Seal

Chip Seal

On Mon-198

bicycle vibration measurement
Bicycle Vibration Measurement

Accelerometers (solid red circles)

GPS unit (dot blue circle)

bicyclist survey
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.
remedial treatment on slo 1
Remedial Treatment on SLO-1

Preliminary measurement

just after construction of

short test sections of sand seal

remarks
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
slide14

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
thanks q a

Thanks!Q&A

John Harvey, jtharvey@ucdavis.edu

Hui Li, hili@ucdavis.edu