2011 Data Grids and Charts
Why is there a large drop in certain data elements beginning with 2002?
The extreme drop in the incidents, injuries, collisions, and not otherwise
classifieds (personal casualties) for 2002 is due to the change of the incident
thresholds, specifically the definition of injuries, in the NTD. The injury
definition was changed for the 2002 revision of the NTD to coincide with other
USDOT modes. Only incidents involving immediate medical treatment away from the
scene now qualify as reportable injuries. Previously, any reported
incident/injury was reported to NTD. It was felt that this resulted in the
collection of claims-based as opposed to safety-based data.
The property damage reportable threshold was also changed for 2002. Incidents
that involve total property damage (not only transit property) exceeding $7500
are reportable to the NTD. Previously, the threshold for property damage
incidents was $1000 in transit property damage only.
Also, all Commuter Rail (CR) Safety statistics are now derived from the FRA
Rail Accident Incident Reporting System (RAIRS).
Purchased Transportation consists of public transit agencies or private carriers
who provide public mass transportation services under contract to recipients of
Urbanized Area Formula funds. Purchased Transportation reported data are only
for those services provided under contract. A list of all reporters is included
in the body of this report.
Transit safety data are collected in four basic categories: Collisions,
Derailments / Buses going off road, Personal Casualties, and Fires. Each of these
categories is further delineated in order to obtain detailed information on the
exact nature of the incident. All transit agencies subject to NTD reporting are
required to report safety data.