Below are the first 10 and last 10 pages of uncorrected machine-read text (when available) of this chapter, followed by the top 30 algorithmically extracted key phrases from the chapter as a whole.
Intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text on the opening pages of each chapter.
Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.
Do not use for reproduction, copying, pasting, or reading; exclusively for search engines.
OCR for page 33
Database Analysis 33
electronically transferred to FMCSA or manually entered by the state agency for MCMIS Crash
file inclusion.
The MCMIS dataset records are at the vehicle level, as opposed to the accident level. There-
fore, if multiple trucks or buses are involved in the same crash, there will be one MCMIS crash
record for each truck and bus. The vehicle focus means that there will always be more records
than accidents. Information coded into the MCMIS Crash file and obtainable from the PAR
includes the date, time, and location of the accident; a description of the vehicle; the name and
address of the carrier; personal information, including driver licensure; parameters that describe
the roadway at the accident location; and the accident impacts. Because the database contains
driver information--name, address, sex, and birth date--the full MCMIS Crash file is publicly
available but only after data that can identify individuals have been stripped out. However, since
driver information was used in this project for various purposes, the project team signed a con-
fidentiality agreement and obtained a version of the file that included the driver fields.
4.1.2 Location and Ownership of Data
The MCMIS Registration and Crash files are maintained by FMCSA and available only to
authorized governmental users on a routine basis.
4.1.3 Database Format
Initially, the MCMIS Crash file contained only one table, but recently it has been divided into
the four tables (CRASH_MASTER, CRASH_CARRIER, CRASH_DRIVER, and CRASH_EVENT)
shown in Figure 4-1.
Figure 4-1. Tabular relationship in MCMIS Crash file.