What is the required brake capacity for trailers, semitrailers, or pole trailers that weigh more than 4500 pounds?

For trailers, semitrailers, or pole trailers that weigh more than 4500 pounds, it is a legal requirement for these vehicles to be equipped with brakes. This is primarily for the safety of the driver, other road users, and the integrity of the trailer. The need for brakes ensures that the trailer can be safely controlled and stopped, especially given the additional weight and potential for increased stopping distance compared to lighter trailers.

Brakes are essential not only for emergency situations but also for regular operational scenarios where controlled deceleration is necessary. The standards established aim to prevent accidents and enhance road safety across all vehicle types.

The other options reflect insufficient safety measures for heavier trailers. The absence of required braking systems, or only having minimal emergency brakes, would not meet the safety standards necessary for vehicles that could pose significant risks if not equipped adequately.