Space

Oklahoma City is the 31st largest city in the US in terms of population, but it is the 7th largest in terms of land area (according to Wikipedia anyway). So the population density is very low, and it is even more 'spread out' than most American cities. Basically, there is a lot of space here, and this is reflected in the most trivial ways. For example, I've noticed that cars tend to leave a lot of space when waiting at intersections, typically a full car length between one car and the next. And people waiting in supermarket checkout queues leave a lot of space between themselves and the person in front. People leave a lot of space here because there is a lot of space available to leave.