I responded to your vid. ran out of characters tho and I just wanted to add that ref: the last mission in the firetruck in your vid - there is a shortcut to the airport so you don't
need to go all the way around as you were pointing out with your mouse - where your vid finishes if you had carried on to the end of that road and turned right, then carried on the the end of that road there is a gap in the wall which you can drive through and then you come to some sand so you have to be careful in the firetruck not to slide into the water - and you'd be sweet. like I said in my comment I've not played this game for donkey's years but I used that shortcut a LOT so I still remember it.
explore a little and it will make completing this game much easier