Vehicle spawn timer Conquest.

How exactly does this work. I mean I noticed sometimes no matter how long you wait vehicles will not be available then a certain area is taken and one becomes available.

Is is dependant on what flags/areas are taken as to which type of vehicle will spawn? As I sometimes notice choppers will not spawn until you push further forward.

It would be better if we had a more detailed vehicle spawn screen instead of counting down across all vehicles and only the light vehicle is available to use.

This seems a bit hit and miss and a bit of luck, I have spawned in a helicopter for example, got taken out and waited for the countdown for the heli's to finish only for non to be available even though there are non on the BF. Then another vehicle decides to become available.