Eh, there are two jerks in that situation, usually, and either could be considerate of inconsiderate. You've got three drivers, A, doing whatever, we'll assume

Eh, there are two jerks in that situation, usually, and either could be considerate of inconsiderate. You've got three drivers, A, doing whatever, we'll assume speed limit +0. Then you've got B, doing speed limit +5 and closing the gap between him and A in the right lane. And finally you've got C, doing speed limit +10 in the left lane, coming up behind B. B could be considerate in that they are assuming that C, being the sort of crazy speed limit who drives faster than themselves, would prefer the chance to accelerate to +15 or +20 and pass both A&B before the A/B pass is executed, but C isn't going to do that because they're happy doing +10 and not a penny over. Or they could be the inconsiderate jerk who isn't paying attention to C at all. C could be considerate in that they assume B wants to be going faster than +5 and are giving them an opportunity to pass A and go at least +10, but B is happy going +5 and doesn't want to go a penny over. Or they could be an inconsiderate jerk who just wants to drive +10 in the left lane and thinks everyone should get out of their way. The end result is that B ends up pissed off that that asshole C refused to pass him and then tailgates him for the next 30 seconds until the pass is complete, while C ends up pissed off that the asshole B waited until the last second to pass and then did so extremely slow. A stays blissfully happy so long as neither B not C hit him, and B doesn't merge back too aggressively while completing the pass, forcing him to decelerate, or C attempts to pass B on the right because B is taking to long to merge, again forcing A to decelerate to maintain proper following distance. In any case, both B&C are jerks for exceeding the speed limit and then acting entitled about it.