Methods and Technologies for Pedestrian and Bicycle Volume Data Collection: Phase 2 (2017) / Chapter Skim
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NCHRP 07‐19(02) Final Report 17 Chapter 2: Research Approach This section describes the approach used for testing the nonmotorized counting devices and technologies investigated in Phase 2.
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NCHRP 07‐19(02) Final Report 18 SENSOR TECHNOLOGY SELECTION Two of the devices included in Phase 2 entered the market for practical pedestrian and bicycle volume data collection after Phase 1 was underway and represented technologies that had not been tested in Phase 1.
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NCHRP 07‐19(02) Final Report 19 Arlington County, Virginia; Washington, D.C.; and Oakland, California.
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Figure 2‐ Source: © Figure 2‐ 1. Arling 2016 Google. 2. Four M ton and Wa ile Run Tra shington, D il (Ground V 20 .C. Sites (Ae iew) N rial View)
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Washing The Wash just south high bicy placed on desired d installed the came system su would ma testing pe had been field of vi Bicycle‐sp one‐week traffic) , th 15th Stre Figure 2‐ ton, D.C.
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Figure 2‐ Oakland, The Oakla Terrace ( sidewalk range rad included the inform sensor to data to th Bicycle‐sp use (coun lane, and tubes we standard 4. 15th S California nd site was Figures 2‐5 a . The radar s io, was buri an access po ation receiv the access p e vendor.
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Figure 2‐ Source: © Figure 2‐ 5. Oakla 2016 Google. 6. Oakla nd Site (Aer nd Site (Gro ial View)
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NCHRP 07‐19(02) Final Report 24 SUMMARY OF TEST SITES AND TECHNOLOGIES Table 2‐1 summarizes the counting technologies and products tested at each site.
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NCHRP 07‐19(02) Final Report 25 All of the counters tested, except for pneumatic tubes, were permanent installations.
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NCHRP 07‐19(02) Final Report 26 as costs associated with ongoing use, such as replacing batteries and charges associated with telemetry.
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NCHRP 07‐19(02) Final Report 27 Table 2‐3. Results of Interrater Reliability Evaluation (Concordance Correlation Coefficients)
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NCHRP 07‐19(02) Final Report 28 DATA CLEANING The automated counters did not export data in a consistent format.
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NCHRP 07‐19(02) Final Report 29 Table 2‐5. Summary of Data Removed from Analysis in Phases 1 and 2 Research Phase Site and Device Reason Phase 2 Oakland radar A single outlier observation was removed due to strong effect on results. Results in Chapter 3 are presented both with and without this observation. Phase 1 L Street inductive loops Very high undiagnosed overcounts, inconsistent with performance at all other sites. L Street passive infrared High overcounts during one month of testing were removed. These were attributed to the installation of the counter, which was oriented toward a plate glass window with foliage in the foreground. During the summer, when temperatures were high, the foliage was suspected to heat up and trigger false positives. Rue Maisonneuve inductive loops Only 4 hours of observations were taken, 2 of which were false 0s, leading to limited reliability of results. University Ave. inductive loop facility counts Data at this location were collected before the need to collect counts for the full facility was identified. The results for the "detection zone" are reported on. Eastbank Esplanade radio beam Automated counts were faulty, with extended periods of 0 counts followed by periods averaging 1000s of people per hour. Berkeley radio beam Automated counts appeared to be faulty, with extended periods of 0 counts during the middle of the day. Midtown Greenway inductive loops (sensor counts only)
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NCHRP 07‐19(02) Final Report 30 SUMMARY OF DATA COLLECTED AND EVALUATED Video data were collected twice for most of the sites in the study.
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