Two days in a row now I've seen SWward moving radar echoes right along the I-95 and 295 corridor around the rush hour time of morning. That's counter to the direction that the rain has been moving each day. I'm using the COD radar page. Could this be rush hour traffic seen by the radar? Don't recall seeing this before.
https://weather.cod.edu/satrad/nexrad/index.php?type=LWX-N0Q-1-24
More likely it's birds/bugs, but the location seemed coincidental.