Why are brake lights on motorcycles sometimes harder to see?

• Because motorcycles don't have brake lights
• Because motorcycle tail lights are smaller and always on, so brake lights don't stand out
  Explanation:

  "It’s harder to see the brake lights. Tail lights on a motorcycle are generally smaller in size than those on other vehicles, and because motorcycle tail lights are always on, the brake lights don’t always stand out. "
• Because motorcycle brake lights are too bright
• Because motorcycle brake lights are too dim