-76.87504, 38.67152 has an issue i cant figure out. I left one of the user submitted complaints that had useful information. Looks like a U-turn of some kind.
It helps if you provide a permalink like this: https://www.waze.com/editor/?lon=-76.87573&lat=38.67128&zoom=6&layers=BFTFFTTTTTTTTTTTTTTTTTTFT
I believe that waze just thinks that the right/U is faster than the left. It happens sometimes.
I am on a work computer and it doesn’t like the permalink. Sorry
I don’t go through there enough to know the light pattern, but I would expect that US301 stays green for a long time during rush hour. A right/U turn would probably get your across half a light cycle faster than waiting for the left turn light under some conditions.