Them facing road rage (someone cuts them off)
Eren
He would cuss whoever it was out in his car, and honk the horn multiple times.
Armin
"Hey!" He would yell. He would think that it was unbelievable that someone could be so rude on the road, and all the things that could have happened.
Jean
He would go the full mile. He would roll down his window and tell the other driver to go **** themselves.
Levi
He would "tch" and silently fume.
Marco
He wouldn't say anything, he would just take a deep breath and go around the person.
Connie
"What a d*ck" he would shame on the breaks trying to make sure he didn't rear end the other vehicle.
Bertholdt
He would gasp, and make sure he didn't hit the other vehicle. "...great." He would be upset and probably tell really close behind just to tick the other driver off.
Reiner
He would probably challenge the other person to see who's vehicle was the fastest. He would race them till they either gave up, were pulled over, or he left them in the dust.