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We have observed high tension  placement of cable posts across a concrete structure using anchored base plates.

I don’t know of a detail for the
low tension cable attached similar to this, do you?

Are there concerns with this type of installation. 

I have not seen a similar detail for common low-tension cable barrier, except for the S3x5.7 slipbase posts used in the terminal region. If the cable barrier design performed in an acceptable manner with line posts embedded in either compacted soil or foundation sleeves with posts plastically deforming at the ground line, then alternative anchoring to rigid pavement should perform in a similar manner. If steel line posts were needed to release out of the foundation system in order for achieve satisfactory performance, then a rigid mounting to pavement could alter barrier performance.