When you sit on the back seat of the car where there is no leg space, no cooling, bumpy roads and bad driver then there is no option left but to sit on the floor. I don't care much about the dirt on my clothes, I can't sit at one place for more than 1.5 hours especially when you can't move and extend your legs. It is not good posture for the lower back. So today I sat on the floor. My cab member were laughing and making fun of me but I care more about my back.