'Police experience' or was it an U turn?

My daily route to the office goes via the Flyover in South Coimbatore. Now the flyover has a road to its right (Dr Nanjappa road, previously known as Jail road ..for obvious reasons). Traffic from this road turns left onto Avinashi road, while traffic from Avinashi road need to go up the flyover to the circle and come back and turn left to get onto Jail road. This morning while I was driving down the Avinashi road to get onto the flyover, two vehicles in front was an Auto rickshaw (a three wheeler). This Autorickshaw decided to make a U turn right at the start of the Flyover rather than go to the circle and make a turn back. This is against the traffic rules as this is against the oncoming traffic and will thereby also hinder the traffic going onto the flyover. The traffic slowed down, and I saw that this was due to the afore mentioned auto rickshaw. I also saw a policeman on a two wheeler ahead of me. Mentally I spoke to the policeman, "hey can’t you see that auto rickshaw breaking the traffic rule … why don’t you stop him and book him for his violation…"
 And 'wow' that policeman seemed to read my thoughts, accelerated on his motorbike, turned his motorbike around and got in right in front of the auto rickshaw…. ………. …….

And then both of them went off into Jail road.