What rights and responsibilities do riders of a horse or horse-drawn vehicle have on a public highway?

• They have limited rights compared to motor vehicle drivers.
• They have no rights on a public highway.
• They have the same rights and responsibilities as a motor vehicle driver.
  Explanation:

  "Horse-drawn vehicles and horseback riders have the same rights and responsibilities as motor vehicle drivers when using public roadways."
• They have the right to block traffic on a public highway.