
Blymurkla |

The only definition of »being in combat« I've found is from the Combat chapter:
1. When combat begins, all combatants roll initiative.
I pondered on this question in regards to Invisibility, which gives you a +20 on Perception DCs to notice you, but a –20 »In combat or speaking«.
My conclusion then was that if you have an initiative score, then you're in combat.
I'd make the same ruling in regards to driving a vehicle. If combat - very hectic, dangerous stuff - is going on around you, even if you aren't directly involved yet, it's going to affect your driving.
Maybe I'd allow the easier DC 5 if the driver chose to forgo her initiative score - quietly trying to mind her own business, driving as if there wasn't a combat. You'd simply move at a set speed each round.
But without an initiative score you aren't acting on the time scale as the actual combatants, and are thus not entitled to react to anything - someone using Create Pit ahead of the vehicle or shoving an ally in its path - and you'd be flat-footed if attacked.

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I don't think a player can elect to "not roll initiative" because the vehicle moves on the driver's initiative.
I would say that "while in initiative" (so to speak) that they could certainly no longer take 10 - I'm just wondering if the (vast) difference in DCs has to do with "being threatened" or "being shot at" or as you said "being in initiative"...