[Ohio] Police running plates while using speeding radar?

Today I was driving and got pulled over, I wasn't breaking any traffic laws and going the speed limit in traffic. There was an officer running what I assume was speed radar from the emergency turn-around, who pulled out about 4 cars behind me, and proceeded to pull me over. He confirmed my identity upon coming to my window, and told me the reason he pulled me over was because my license had come up as suspended, which was accurate. I provided him with my work privelages and he let me continue on my drive.

I am not in any legal trouble nor did I receive any ticket, but I am very confused - I did not break any traffic laws, nor was ever followed by this officer for him to run my plates. How was he able to see my license was suspended? Is there technology on officers that lets them automatically scan and flag license plates going by even at those high speeds? Also, is it legal to run plates like that without any suspicious reasoning? I felt very violated that I got pulled over going down the road - I understand my plates run as suspended with privelages, but I didn't break any traffic laws or do anything to give any officer suspicion to that.

Like I said again, I am not in any legal trouble, nor was the officer anything but polite to me, I just had some questions about the entire interaction! I've passed several police like that going to/from work before and this had never happened to me before. Thank you!