Typically we do not recommend installation of PCBs in front of curbs or other obstructions that limit translation of the back face of the barrier.
The concern is that restraining the back of the barrier will cause the barrier to rotation rather than translation when impacted. This will tend to induce increased vehicle climb and stability on the toe and the sloped face of the barrier.
Anchoring of the barrier will help reduce this significantly depending on the type of anchorage used.
It is also less of a concern at the 45 mph speed you are using which corresponds to TL-2 speeds as compared to TL-3.
We would generally recommend anchoring in this case to prevent the rotation.
If you had the room, you could provide 24” between the back of the PCB and the curb to allow for translation and redirection prior to interaction with the curb. However, I don’t know what your space limitations are.
Thanks
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