Alright, so after many hours of reading online guides and having some much needed help from Sam, I managed to put together something extremely simple.

 

I know I had planned to do some sort of ANPR, but I see that Sniper has already got that covered and it'd probably be too much for me as an utter newbie to scripting, what I have done (or plan to continue doing) is incorporate the rest of the megaphone speeches that the AI use and then modify surrounding peds and vehicles so they react appropriately,

 

So far, I've got the speech working when you press 9 on the NumPad. Although it requires you to be in the COP BLACK skin with the same voice (not all models have the speech files).

 

What I need some help with:

 

The ped functions. I've so far tried putting this underneath;

World.GetClosestPed(Vector3 Position, float Radius);

But that's throwing up some errors, I need someone to explain how I can get this working. Same with the vehicles

 

If someone has the time, and patience, I'd love to hear how I can get peds and cars in a radius and cause them to react appropriately.

 

Many Thanks.

Closest vehicle should work out of the box but closest ped function is totally unreliable.

 

Try something like this (may contain errors):

float dist = 1000f;
            Ped pedToFind = null;
            foreach (Ped p in World.GetPeds(Game.LocalPlayer.Character.Position, 30f))
            {
                if (p.Exists())
                {
                    float distCalculated = p.Position.DistanceTo(Game.LocalPlayer.Character.Position);
                    if (distCalculated < dist)
                    {
                        pedToFind = p;
                        dist = distCalculated;
                    }
                }
            }
            if (pedToFind.Exists())
            {
                // do something with closest ped
            }

I wonder if it would be possible to make the script activate when the AI also does that speech. It'd be nice to see the AI react to AI cops in some fashion.