A web search will turn up a bunch. Here's one - https://www.gmcmap.com
Also... why wouldn't the feds just say they're inspecting infrastructure and avoid the entire question...?
IMO this is almost certainly a commercial LIDAR mapping effort plus right wing conspiratorial hysteria.
A single value at a moment in time doesn't mean anything at all. You need to see the variance over time. And you need to trust the source data. The only "dangerously high" readings I saw were from counters that had no name, no history, no identifier, no additional values.
This theory makes no sense from the get-go and this "evidence" is extremely low quality.
You sort of people are so weird.