How to close a road/block traffic with a cleo script?

[morrisons90]

I'm trying to add some police backup to my paramedic script. When they get to a scene I thought it would be nice if they could stop traffic to make it easier for the player.

 

Does anyone know of a way to either:

 

-Freeze all cars in a radius.

-Create a invisible obstacle the AI can see and want to drive round.

-Make nearby drivers abandon their vehicles.

-Make the ai not drive on the roads the player is on (I have seen this with wanted level roadblocks. Traffic will not head toward a roadblock unless you get rid of the wanted level)

 

I can stop traffic from spawning but I think the visual effect of the police getting there and all the traffic stopping would add a lot to the experience.