head-on vs involving the front of a vehicle

head-on

adj

Of a collision, from the front or in the direction of motion.
Direct, abrupt, blunt or unequivocal; not prevaricating.

adv

With the front of a vehicle.
With direct confrontation.

noun

A collision from the front.

involving the front of a vehicle

How often have the words head-on and involving the front of a vehicle occurred in a corpus of books? (source: Google Ngram Viewer )