Trucks use retread tires to save money with the trade off of higher blowout rates. The driver could pull over safely as each axle has more than one tire. This

Trucks use retread tires to save money with the trade off of higher blowout rates. The driver could pull over safely as each axle has more than one tire. This is also why retreads are not popular these days (or illegal) for car use as you don't have redundancy if a tire blows.