The operator of the car rides could turn off the horns by leaving the lights out. I used to leave them out during the Looney Tunes show until about the 50th time I watched the show. Then I left them on to drown out the noise of the show.
It looked like the large cars (Beep Beep Buggies) was the most popular ride in BBL...or perhaps after the train. I would open a small kiddie area in the Old Country with the large cars, small cars (Daffy Duck's Magical Motorcade,) the little bumper cars, the little ferris wheel and a new speedtrap. Screw BBNP!