I had a bizarre one the other day. Big fire at a power station in Pembroke, West Wales. Batt Chief attended from the station across the water by going in a direct line rather than the roads that everything else used. Strangely, when loaded ambulances left, they did the same, but everything else went back on the roads.
I have had my units go in a straight line when responding to limited access highway is usually when it happens but it is rare when that happens for me.