I hope you guys can give me some insight into this situation. So, I was driving home from my parents' house tonight (just past midnight on Monday night) and I'm nearly the only person on the highway. A two state troopers pass me one by one within a 2 minute (2 mile, traveling 60 mph) span. About one mile after the last one passes me, and a quarter mile ahead of me, they turn on their lights and block both travel lanes while a third blocks the shoulder (I don't recall a 3rd passing me, he might have already been on the shoulder). I slow down and drift towards the blockade at about 20 miles an hour. I don't know if they are closing the road, or if they're setting up a roadblock, or if they want me to pull over or what. As I get near the cars, expecting them to tell me to pull over (or take a detour,) the two blocking the travel lanes turn off their lights and drive away. The one on the shoulder keeps his lights on. The road was blocked for approximately 30 seconds from what I could tell. There is a new law in Maryland where if an emergency vehicle has its lights on on the shoulder, you have to move over at least one lane away, so I do that, pass the officer, and then get back into my lane. That officer stays on the side of the road with the lights on as I get off on my exit. Were the police just bored and wanted to mess with me? Did they get orders to block the road and change their mind? Were they just checking on the officer on the side of the road, and then decided to keep going? I'm just really confused by their behavior.