Guidebook for Conducting Local Hazardous Materials Commodity Flow Studies (2011) / Chapter Skim
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From page 43... ...
Collection of new data specifically for an HMCFS may include the following: • Interviews with shippers and receivers, carriers, emergency managers and responders, and other key informants; and • Traffic surveys ranging from very simple truck counts to much more complex examination of shipping manifests. 43 C H A P T E R 5 Collect and Validate New Data Considerations for New Data Collection Collection of new data tends to be focused on roadway commercial and service truck transport because • Locally relevant hazmat transport data for roadways are generally lacking or more difficult to obtain from existing data sources.
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44 Guidebook for Conducting Local Hazardous Materials Commodity Flow Studies Figure 5-1. The HMCFS new data collection and validation process.
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• When are the hazardous materials shipped/received/carried by time of day, day of week, season of year, etc., and what is the frequency of shipment? • How are the hazardous materials shipped/received/carried (modes)
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However, trends for overall truck traffic may not directly apply to hazmat truck traffic, especially where seasonal variations in hazmat production, processing, or consumption apply. 46 Guidebook for Conducting Local Hazardous Materials Commodity Flow Studies Considerations for Selecting Traffic Survey Locations • The safety of data collection personnel and the driving public is paramount.
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• Longer count durations are possible, but they should be recorded in separate 30-minute or 1-hour segments. • Starting count intervals on the half-hour or hour can ease data analysis for differences in traffic patterns by time of day.
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Table 5-1 provides a summary of traffic sampling framework examples, as well as the advantages and disadvantages of each. Appendix D.2, Let HMCFS Objectives Guide Sampling, 48 Guidebook for Conducting Local Hazardous Materials Commodity Flow Studies The LEPC in Polk County, Texas, used a focused data collection effort on two major highway corridors for their commodity flow study.
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, discussed in Section 5.3.1.2; • Types of hazmat placards observed, discussed in Section 5.3.2; • Combinations of vehicle and hazmat placard observations, discussed in Section 5.3.3; • Vehicle and/or hazmat placard observations on both roadway directions or at intersections at the same time, discussed in Section 5.3.4; or • Number of containers or packages in a shipment -- this can be considerably difficult for most truck traffic surveys to determine, except for shipping manifest surveys, discussed in Section 5.3.5. Hazmat characterization information may include the following: • Whether a vehicle is carrying hazmat over placarding threshold levels (e.g., whether a truck does/does not have a placard)
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The truck types and configuration examples are grouped in eight different categories ("A" for standard gas and liquid tanks through 50 Guidebook for Conducting Local Hazardous Materials Commodity Flow Studies Survey Method Description What It Provides What It Requires Total Truck Surveys A count of the total number of observed trucks Information about overall truck traffic levels during sampled time periods Assumptions about hazmat transported on observed trucks (e.g., that hazmat transport conforms to national averages) ; assumptions about types and configurations of trucks used to transport hazmat Truck Type and Configuration Surveys A count of observed trucks by truck type and configuration Information about truck traffic levels, by type and configuration, during sampled time periods Assumptions about hazmat transported on observed trucks by type and configuration (e.g., that hazmat transport conforms with national averages)
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on a data sheet for each count. A blank total truck count sheet and a completed example sheet are provided in Appendix J.2.
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A blank placard count sheet and a completed example sheet are provided in Appendix J.4. Multiple placards on the same truck should be circled to differentiate between all placards observed and the number of placarded trucks observed.
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These counts can be used to identify overall truck traffic levels, proportions of truck traffic by type and configuration and the percentages of placarded trucks for each category, and identification of the hazmat placards. This information also can be used for rough estimates of relative quantities (small, medium, or large amounts)
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A blank truck type and configuration and placard ID count sheet and a completed example sheet are provided in Appendix J.6. Multiple placards on the same truck should be circled to differentiate between all placards observed and the number of placarded trucks observed.
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DOE has conducted shipping manifest studies for 24-hour continuous counts at license and weigh stations in cooperation with state enforcement agencies. Information collected includes the following: • Time of day, • Shipment origin/destination, • Truck type, • Placard class/division and UN/NA ID, • Material description, and • Shipment weight.
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Analysis of HMCFS data is described in Chapter 6. 56 Guidebook for Conducting Local Hazardous Materials Commodity Flow Studies
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