* Vehicle Code Section 21057: Allows the operation of a farm tractor or implements of husbandry "operated solely for agricultural purposes" on all highways
* California Vehicle Code 25800(b): Requires slow-moving farm vehicles to display an emblem visible from the front and the rear.
* California Vehicle Code 25900(b): Requires animal-drawn vehicles and any farm vehicle with a maximum speed of 25 miles per hour to display a red slow-moving vehicle emblem on its rear.
Here are some additional rules and requirements for driving a tractor on California highways:
* The tractor must be equipped with the required safety features, including brakes, lights, and a horn.
* The driver of the tractor must have a valid driver's license and be familiar with the rules of the road.
* The tractor must not be driven at a speed that is faster than 25 miles per hour.
* The tractor must yield the right of way to other vehicles on the highway.
* The driver of the tractor must be aware of the dangers associated with driving a tractor on a highway.
* When operating on the roadway, the tractor needs to be equipped with a slow-moving vehicle (SMV) emblem with a red background and a fluorescent yellow-orange triangular border
It's important to note that these rules and regulations may vary depending on the specific county or region in California, so it's always best to check with the local authorities for the most current information.