| Terms | Definitions |
|---|
| Wall Thickness | Thickness of material used to constuct pipeline. ( Pipeline Safety Statistics ) |
| Water | Shipments using shallow draft vessel only, deep draft vessel only, or Great Lakes vessel only. Combinations of these modes, such as shallow draft vessel and Great Lakes vessel are included as Other multiple modes. ( Commodity Flow Survey ) |
| Weekday | From 6 a.m. Monday to 5:59 p.m. Friday. ( Fatality Analysis Reporting System ) |
| Weekend | From 6 p.m. Friday to 5:59 a.m. Monday. ( Fatality Analysis Reporting System ) |
| Weekend Trip | A trip including an overnight stay on a Friday or a Saturday night. Travelers who stay one or two nights away including a Friday or Saturday night are defined as regular weekend travelers. Those who stay three to five nights away including a Friday and/or Saturday night stay are defined as long weekend travelers. ( American Travel Survey ) |
| West North Central Division | Minnesota, Iowa, Missouri, North Dakota, South Dakota, Nebraska, Kansas ( American Travel Survey ) |
| West South Central Division | Arkansas, Louisiana, Oklahoma, Texas ( American Travel Survey ) |
| Wheelbase | The distance from the center line of the front axle to the center line of the rear axle. ( Fatality Analysis Reporting System ) |
| Whistle Ban | A whistle ban or train horn ban is a prohibition of the sounding of locomotive audible warning devices within a local community or at specific highway-rail grade crossings. Whistle bans have historically been established by local ordinance or through agreements with specific railroads pursuant to existing state law. Studies have shown the silencing of locomotive horns greatly increases the safety hazard to vehicles at highway-rail grade crossings, since no specific safety improvements are made to compensate for the absence of the audible warning. ( Railroad Accident/Incident Reporting System ) |
| World Area Code (WAC) | Numeric codes used to identify geopolitical areas such as countries, states (U.S.), provinces (Canada), and territories or possessions of certain countries. The codes are used within the various data banks maintained by the Office of Airline Information (OAI) and are created by OAI. ( Air Carrier Statistics, Small Air Carrier Statistics, Airline Origin and Destination Survey (DB1B), Aviation Support Tables ) |
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