Is there a satellite dish near that corner where you get the alert? It could be that, or someone with a Crapra who leaves it on in the parking lot every day. Is it a high school (where students may drive/park there)? That would increase the chances of a Crapra.
I doubt it's real radar (would be closer to 33.8 if it's a MPH gun), and I've never heard of a RD falsing on a Spectre (though it's certainly not impossible).
Try turning RDR on for a couple days and see if the alert goes away.
P.S. Cool, my 6,000th post!
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