Just a scenario I’ve experienced— You’re at the super market in one of those help your self lines. Unless the store is not busy, there is always some traffic.

Sometimes you have one or a few items, and someone in front will let you pass. (Will wait)

Other times someone in front of you has a lot and they apologize for holding up the line. You might think, no problem at all. (Is patient)

And yet others are so harried and stressed they will take every advantage offered. (Always go)

Seems there is enough variation just on personal experience. Supermarket lines could be a good simulation.

Not necessarily, you can have cars communicate locally to compute better strategies, and to provide suggestions to drivers for this strategies.

Same for map apps

In practice, not really! Only when others around them also act selfishly, or there is urgency.

People may not act outwardly selfishly, but people may not realize that their individual action is selfish from a game theory perspective.

Everyone takes the highway because it is the fastest way to travel. However every additional car does slow it down. And this will continue until travel times on the highway either match non-highway travel times or the road literally can't handle more people. But no one thinks that driving the car to the grocery store across town to redeem a coupon is "selfish", because everyone thinks they're in traffic, not that they are traffic.

If you show people two routes, they will choose the faster one. Even if you tell them it would be very helpful to take the slower one.