Actually, it might surprise you--I've spent 5 months as a passenger in the back of a truck over generally exceedingly bad roads. (Extreme example: The truck was going as fast as it safely could over the terrain. I grabbed the side of the truck and climbed aboard--the driver knew I was going to, the road was limiting him to a speed that he didn't need to slow further.) The driver wasn't playing games with the gas & brake but the potholes were such that cars would have bottomed out and gotten stuck.
I'm not surprised at that experience. I
am surprised am, sadly, not surprised that you are equating it with what happened in that van. FWIW, I have ridden in the back of a number of vans, busses, trucks, etc. over fields and some rough country roads. Not as a prisoner. The problem isn't the potholes or ruts but rather unexpected braking, even if the driver is taking care to do as little harm as possible to passengers who all had the use of their hands, feet, wits, etc. to brace themselves against the inevitable falls. VS the case of Freddie Gray, intentional braking, with the opposite kind of care taken.