Meaning of headroom

[Anchela]

English Language Tests, Intermediate level

ESL/EFL Test #190 "Compound words: head", question 7

I was very disappointed to find out that the new car that I wanted to buy had insufficient ..........

(a) headlight
(b) head set
(c) headroom
(d) headlamp

English Language Tests, Intermediate level

ESL/EFL Test #190 "Compound words: head", answer 7

I was very disappointed to find out that the new car that I wanted to buy had insufficient headroom.

Correct answer: (c) headroom

Your answer was: incorrect
I was very disappointed to find out that the new car that I wanted to buy had insufficient headlight.
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What does headroom mean?

Anchela

[Conchita]

headroom
noun [U]
the amount of space below a roof or bridge:

It's a small car but there's lots of headroom.

(Cambridge Advanced Learner's Dictionary)