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 1 Abstract This report documents the research conducted by NCHRP Project 07‐19(02)
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NCHRP 07‐19(02) Final Report 2 Summary NCHRP Project 07‐19 evaluated six automated count technologies that capture pedestrian and/or bicycle volume data.
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an al P ru co se th p Figure S‐ are define (a) (c Figure S‐ d motor veh l vehicles wi iezoelectric nning over mbination p parate pass at pass the s assing the co 1 illustrates d and illust Thermal imag )
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NCHRP 07‐19(02) Final Report 4 Table S‐1 summarizes the amount of data evaluated in Phase 2, categorized by the environmental and user volume conditions under which the data were collected.
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NCHRP 07‐19(02) Final Report 5 From the researchers' point of view, locations with relatively high bicycle volumes, to allow the devices' accuracy and precision to be tested under a range of volume conditions; From the jurisdictions' point of view, locations that would provide useful data for them in the future, as they would take over ownership of the counter following the tests; and From the vendors' point of view, locations that complied with the vendors' guidance for suitable installation locations for the sensors and their supporting technology (e.g., detection area dimensions, access to power, radio communication ranges)
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NCHRP 07‐19(02) Final Report 6 Table S‐2. Counting Technology Key Findings: Combined Results from Phases 1 and 2 Technology Mode Research Phase APD AAPD WAPD r N Average Hourly Volume Passive infrared C 1, 2 −3.5% 22.5% −9.5% 0.938 398 258 Product A C 1 8.7% 22.2% −1.6% 0.949 244 279 Product B C 1 −26.0% 26.4% −27.0% 0.982 115 263 Product C C 2 −13.5% 13.5% −13.6% 0.988 39 113 Active infrared C 1 −6.6% 7.3% −7.6% 0.998 34 327 Thermal imaging camera B, P 2 5.5% 22.5% 2.7% 0.912 28 101 Bicycle−specific tubes B 1 −19.8% 22.2% −17.1% 0.979 262 167 Product A B 1 −9.5% 10.8% −11.1% 0.993 172 203 Product B B 2 −69.1% 69.1% −59.6% 0.841 47 117 Product C B 2 −7.3% 16.6% −9.4% 0.920 43 76 Standard tubes B 2 −15.2% 17.1% −17.9% 0.936 17 62 Radar B, P 1 22.7% 27.8% 14.2% 0.918 31 72 Surface inductive loops B 1 3.8% 10.5% 4.8% 0.959 136 155 Embedded inductive loops B 1 0.3% 7.6% −3.1% 0.997 29 145 Surface inductive loops (facility counts)
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NCHRP 07‐19(02) Final Report 7 Chapter 3 provides details about the calculation of these accuracy and precision measures.
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NCHRP 07‐19(02) Final Report 8 Thermal Imaging Camera (Phase 2)
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NCHRP 07‐19(02) Final Report 9 interval, which was done incorrectly at one site, such that the device could not easily be validated in the same effort as the other devices at the site.
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NCHRP 07‐19(02) Final Report 10 undercount of 4.5% and a total deviation of 4.5%.
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NCHRP 07‐19(02) Final Report 11 rely on these "general" factors for purposes of calibrating count data, as myriad factors may affect the accuracy of any given deployment.
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NCHRP 07‐19(02) Final Report 12 infrared sensors are susceptible to false positives when windows, mirrors, or other reflective surfaces are positioned behind the pathway being counted.
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NCHRP 07‐19(02) Final Report 13 The project's accuracy findings should not be blindly applied to other sites than those at which these technologies were tested at, and it should not be assumed that the same degree of accuracy will occur at other site locations or with other products.
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