I'm stuck with this mission.

CARRY ON DOCTOR
Columbia

First I clean the Map of Hostile Agents.
Then I get the Ambulance and drive it to the doctor.
I leave the Ambulance in front of the Doc building.

Then I go into the building and "activate" the doctor.
Then the doctor starts walking around the entire access road an never stops.

He does not go into the ambulance.
He only walks in "Giant Circles" around the road.

Does anyone know how I have to beat the Mission?

Have not played it so just a guess, can you use the Persuadatron to put him in the ambulance?

Never, EVER persuade npc that is supposed to act on their own unless mission stated otherwise or you want restart mission again. Sometimes pathfinding fails so you need to repeat mission many times enough so he can find correct path to your vehicle. This is problem with the game itself based on so close multi-layer sprites and tiles collision system to very smallest pixel.

Try different approach with your vehicle and trigger npc form the various angles and sides. It's a known issue but no way to solve this because how engine and pathfinding works.

Maybe you have already solved, but if someone still have problem with this mission:

- do not persuade the target
- leave the ambulance on the zebra cross

He will go out and take the drive the ambulance alone. If he don't come out try to leave the ambulance in different spots, always near the zebra cross.

I can not get to the ambulance - the vehicles you can get into to get through the doors always turn around at the doors and don't go through them.

If the doctor doesn't "activate" after parking the ambulance but instead continue to walk around inside the building you can try to move your squad in with guns drawn. Until activated, the doctor will act like any other civilian and flee. Once outside, his script should trigger and he should walk to the ambulance.

Also, it doesn't matter on which lane the ambulance is parked, both work fine.