What is the primary danger when an animal-drawn cart with iron-rimmed wooden wheels (ruedas de fierro) travels on smooth asphalt or concrete roads?

1. The wheels will melt
2. Iron rims have very low friction on smooth pavement, resulting in dangerously long stopping distances, severe skidding on downhills, and loud clattering that can spook draft horses
3. The cart will travel faster than 80 km/h
4. The wheels turn into rubber automatically