Why do people put cow bells on trucks????

What is the purpose of wearing a cowbell when hiking? - Quora

Cowbell - Wikipedia

Video shows cow tumble from truck onto Birmingham highway

Cowbell - Wikipedia

Cowbell - Wikipedia

Fundraiser by Tracy Smith : My Trucker Everett Smith Needs Your Help

Why do Swiss Cows wear bells?

Effects of noise on cattle performance - Dairy Global

Why do cattle wear bells? - Quora

Swiss town denies passport to vegan anti-cowbell campaigner 'for