[peeps36]

Front seat of a car. They’re hands would be cuffed in front of them and they would be wearing leg irons. Prisoners transported in the back of vans or a bus would be restrained with leg irons and belly chains.

[ansel12]

That sounds like totally different transportation, more similar to school kids on a bus.

Here are two different police vans, one of them looks made for giving "nickel rides" if someone wanted to.