What does 'curb-side model' mean?

[ggdrew]

... and what would then be 'non curb-side'?
Thx!

[steveo3002]

non opening doors /bonnet vs opening panels and an engine etc

[Eric Mc]

In other words, limited internal detailing.

[Plinth]

Used to be called "slammers" I think - an American term from years ago.