If a traffic officer, from their vehicle, orders you to stop by switching on a device with a flashing red light directed forwards, where must you do so?

Signage: Vertical signs

If a traffic officer, from their vehicle, orders you to stop by switching on a device with a flashing red light directed forwards, where must you do so?
A flashing red light at the front of a police vehicle indicates that you must stop with caution on the right-hand side of the road, ahead of the patrol car, choosing a place where stopping does not increase risk or cause unnecessary inconvenience.

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