
The distance from the hip of a vehicles occupant to the vehicles interior rooftop.
Found on
http://www.edmunds.com/glossary/

The space between the top of a subject`s head and the top of the frame. Headroom must be carefully apportioned so that there is not too much or too little, especially if shooting for transfer to video or for blowup, where the frame will be cropped in a little on the top and sides
Found on
https://www.encyclo.co.uk/local/21112

The distance from the top of an occupant's head to the headliner.
Found on
https://www.encyclo.co.uk/local/22335
No exact match found.