No, you weren’t imagining things on your commute that morning. Those were, in fact, two horses grazing near the off-ramp from northbound I-395 to Glebe Road.
It’s unclear why exactly the horses were there — some sort of accident or mechanical mishap involving the tow vehicle, perhaps — but those tending to the horses apparently decided that they needed to munch on some grass while waiting to continue on with their journey.
Finally, around 10:00 this morning, the horses loaded back into the trailer, following the arrival of an SUV. Minutes later, the SUV towed the trailer away and everything was back to normal.
Photo (right) courtesy Matt Coyne