Center for Transportation Studies University of Minnesota
A human factors study was performed to identify potential cause of accidents at eight
Transitway intersections. Data were collected on bus operators' driving behavior, on motorists'
behavior at Transitway intersections and on sight distances at the intersections. From some of this
data and the accident history at each intersection we calculated accident frequencies based on the
number of cars crossing each intersection per year, then related some of our findings to both
accident frequency and the immediate causes of reported accidents.
An analysis of the data suggested that the following were potentially contributory to
* Two percent of the drivers run the stop signs and about 50% of the drivers use a rolling rather
than a full stop.
* About 20% of drivers do not look both ways before crossing the Transitway.
* Winter weather brings slippery roads and reduced visibility conditions.
* The timing for bus actuated traffic lights may not be optimal.
* Only five of the 32 sight distances met minimum guidelines.
Our broad conclusion was that combinations of the above factors could well contribute to the
accidents occurring at the Transitway intersections. Specific recommendations were made for
addressing each of the above factors.
Stackhouse, Stirling; Tranchida, Donna.
Human Factors for Transitway Safety Improvement, Final Report for Phase 1.
Center for Transportation Studies University of Minnesota.
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