The Vehicular Mayhem basic move is inspired by talk of zooming in and out of the various circles in the cyberpunk Venn diagram, a disappointment in other PtbA games ability to mimic the play style of media such as Dark Matter, Kill Joys, or The Expanse to the degree The Sprawl could, and a desire to treat diverse vehicles such as mechs and space-faring ships as more than just blunt objects while still providing more options for terrestrial combat vehicles, helicopters, submersibles, etc…
The new vehicle threat type is different from the other threats in that it is of immediate concern to the players; does not typically extend across multiple sessions. This is not meant for mere cannon fodder or speed bumps. Ways the vehicle threat clock can be used is as an exit from the charged situation, rather than say, just armor in a fight to the death (which is still a viable option if fictionally appropriate). So, for example, the clock represents a chase/race to an endpoint, a vehicle running out of ammo/fuel, fulfillment or failure of the vehicle threat’s goal, etc.
https://drive.google.com/file/d/0BzkvDZfGsnq3NS16NTBGSldfT0U/view