Like a large fog horn. Deep notes and loud, super loud
the trains horn is very loud.
Super loud they have be that loud in case a a jerk in front of you is not paying atttenion.
A horn or a siren can produce a loud sound.
a goal horn is a horn that sounds off after a goal the home team scores. the most common types of horns used are train horns, boat horns, fog horns, barge horns and sometimes truck horns. they can be loud, but it depends on the amount of PSI they're fed.
Klaxon
horn
3 blasts on the horn says you are going astern
"klaxon"
the marching band was as loud as a train horn.
TOOT
One long honk on the horn