The local evaluation report assessed how well the project goals and objectives were met, provided the direct and indirect benefits of the project, and discussed the technical and institutional issues that were encountered while completing the project.
The truck rollover warning system installed on the Pennsylvania Turnpike was designed to alert truck drivers of a dangerous curve at the Breezewood Interchange. This warning system was one component of the project where immediate results were seen. Data was collected 21 months before the installation of the truck rollover warning system and compared to data collected 21 months after system installation.
Five rollover crashes occurred prior to system deployment, and after the installation, only one crash occurred, which was attributed to a passenger car that went out of control and forced a nearby truck to make a reactive move and roll over.
Also noted was a reduction in the speed of trucks exiting the mainline. After the installation of
system, the evaluation showed that trucks entering the off-ramp demonstrated the following speeds:
- Mainline speed – 65 M.P.H.
- Truck Speed Approaching 1st set of Detectors – 52 M.P.H.
- Truck Speed Approaching 2nd set of Detectors – 42 M.P.H.
- Truck Speed Approaching Blank-out Signs – 29 M.P.H.
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