By what means may police officers signal a demand to stop a vehicle?

• 1A signal disk with a red signal or a reflector, or a hand, pointing to the relevant vehicle and the subsequent place for it to stop.
• 2A turned-on flashing beacon of blue and red or only red colour and (or) a special audible signal.
• 3Of a loudspeaker device.
• 4A special display board on which a requirement to stop the vehicle is indicated.
• 5Of any of the means listed above.