Identification of Vehicular Impact Conditions Associated with Serious Ran-off-Road Crashes (2010) / Chapter Skim
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Pages 55-64
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From page 55... ...
There remains a need for a longterm effort to collect in-depth data on single-vehicle, ran-offroad crashes in a continuous and systematic manner. This long-term data collection effort will require a sponsoring agency with continuing funding sources.
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From page 56... ...
Second, with supplemental field data collection, the portion of the CDS cases involving single-vehicle, ran-off-road crashes will be available for use at a relatively low cost. Third, under the NASS special study subsystem, cases may be selected outside of the CDS sample to address specific types of crashes under study.
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From page 57... ...
The special study subsystem is the more appropriate vehicle for collecting detailed information on selected roadside features. It is anticipated that the supplemental field data elements for the continuous sampling subsystem would be similar to those used in the current study, with perhaps a few more data elements and additional photographs.
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From page 58... ...
In addition, the investigator would receive special training to collect and code the new data elements for the continuous sampling subsystem and the special study being conducted. 5.3.3 Quality Control Two Zone Centers currently provide the quality control and oversight of the PSUs in the CDS data collection effort.
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From page 59... ...
for PSU 78. For each sampled case, the PSU and Zone Center personnel were asked to complete a log form, documenting the time required to collect, process, and quality control the additional field data and to reconstruct the cases except for impact speed, including: • PSU – Field time to collect the additional data – Office time to process the additional data • Zone Center – Time to quality control the additional data – Time to reconstruct the impact conditions other than impact speed Note that these times pertain to only the additional data elements and not the time required for the NASS CDS data collection effort.
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From page 60... ...
Additional Time Required (Minutes) PSU Zone Center Case Number Field Office QualityControl Reconstruction Total 04-48-235J 60 20 10 40 130 04-48-238K 30 45 5 25 105 04-48-246D 20 30 5 35 90 04-48-253H 60 120 5 35 220 04-48-254B 50 50 5 10 115 04-48-259K 30 20 5 15 70 04-48-262C 20 20 10 30 80 04-48-265K 40 40 10 20 110 04-48-267J 60 20 10 50 140 04-48-274J 25 5 5 25 60 04-48-280K 60 120 10 65 255 PSU 48 Average 41.4 44.6 7.3 31.8 125.0 04-78-134D 60 60 10 35 165 04-78-140K 120 0 10 35 165 04-78-143K 90 60 10 20 180 04-78-144J 60 60 10 30 160 04-78-148K 60 0 10 50 120 PSU 78 Average 78.0 36.0 10.0 34.0 158.0 Combined Average 52.8 41.9 8.1 32.5 135.3 Table 91.
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From page 61... ...
The combined field and office time at the PSU level ranges from 30 to 180 minutes with an average of 94.7 minutes. At the Zone Center level, the additional time for quality control of the supplemental data ranges from 5 to 10 minutes with an average of 8.1 minutes.
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From page 62... ...
On the other hand, the actual sample size and the PSUs to be included in the data collection effort is merely a question of available funding. 5.5.2 Data Collection Forms The proposed data collection forms and procedures for the continuous sampling subsystem are similar to those used in the current effort and the pilot study, but with some enhancements based on experience gained in this study, including: • Supplemental Highway Data Collection Form • Object Struck Data Collection Form: – Barrier – Crash Cushion – Embankment – Pole Support – Tree – Other Struck Object • Reconstruction Coding Form: – First Harmful Event – Subsequent Harmful Event • Performance Assessment Form • Scene Photographs Copies of these proposed data collection forms and the corresponding coding and field procedures manuals are included in Appendix F
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From page 63... ...
5.6.2 Data Collection Forms The general structure of the data collection forms and procedures for the special study subsystem would be similar to those used with the continuous sampling subsystem, including but not limited to: • Supplemental Highway Data Collection Form • Object Struck Data Collection Form • Reconstruction Coding Form • Performance Assessment Form • Scene Photographs However, the forms would be tailored to the specific roadside feature/object under study. The Supplemental Highway Data Collection Form would likely remain mostly unchanged.
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From page 64... ...
In addition to the training required for the regular CDS data collection and the continuous sampling subsystem, both PSU investigators and Zone Center personnel assigned to the special study data collection effort would require special training in order to collect and quality control the specific and detailed data for the special study. The training would be conducted by the outside contractor on data elements, coding instructions, and field procedures specific to the special study data collection effort.
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