Procedures to follow in the event you are stopped by uniformed police Officers while driving.

Stop the car and wind down your window.
If the police officers ask for your documents, request to see their IDs first.
If you are satisfied about their identity, ask them if you are being summoned, and for what offence.
Produce your identity card and driver's license and wait to collect your summon ticket.

U can straight drive away. BUT immediately drive to police station and make a report. OR u can ask the policeman to wait, call up the police station and ask whether he is a real policeman a not.

Most advisable is call up the police station. You have the right doing so. In my opinion, if u drive away, they have the right to open fire too as they could say u are a suspicious suspect.