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| | BTS | National Transit Database (NTD) and Safety ManagementInformation System (SAMIS) |
 | | Almost all the variables in the NTD represents a census of the data on publicly funded bus, transit rail, commuter rail, ferry, paratransit, and vanpools in urbanized areas. |
 | | The only exception to the census is the data for passenger miles, where a random sample of bus and rail routes is used to calculate average trip length for each mode. |
 | | For this reason, the NTD is one of the more complete industry databases in the Federal government. |
| www.bts.gov /programs/statistical_policy_and_research/source_and_accuracy_compendium/FTA_national_transit.html (2433 words) |
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