| Terms | Definitions |
|---|
| Jackknife | Jackknife can occur at any time during the crash sequence and is restricted to truck tractors pulling a trailing unit in which the trailing unit and the pulling vehicle rotate with respect to each other. ( Fatality Analysis Reporting System, General Estimates System (NASS/GES) ) |
| Jackknife can occur at any time during the crash sequence. In this report, jackknifing is restricted to truck tractors pulling a trailing unit in which the trailing unit and the pulling vehicle rotate with respect to each other. ( Trucks Involved Fatal Accidents ) |
| When two sections of a truck turn and form an angle of 90 degrees or less with each other during a crash. ( Trucks Involved Fatal Accidents ) |
| Jitney | A transit mode comprised of passenger cars or vans operating on fixed routes (sometimes with minor deviations) as demand warrants without fixed schedules or fixed stops. ( National Transit Database ) |
| Journey-to-Work (JTW) | The one-way trip from home to work, or a commuter trip. ( Census Transportation Planning Package ) |
| Julian [Date] | The date according to the Julian Day Number system, in which days are counted from the beginning of the year through 365 or 366. ( Trucks Involved Fatal Accidents ) |
| Junction | Area formed by the connection of two roadways, including intersections, interchange areas and entrance/exit ramps. ( General Estimates System (NASS/GES), Trucks Involved Fatal Accidents ) |
| Area formed by the connection of two roadways, including intersections, interchange areas, and entrance/exit ramps. ( Fatality Analysis Reporting System ) |
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