Edit: Did you even bother to read the law before you commented?, the first fkin line, and (b), Line (1) burden of proof is on the defendant, not the prosecution, it will be judged by his peers. The (2) will fail if protestors are on allowed/blocked road ways and will only apply if protestors are illegally on non-permitted road ways.
(1) the person operating the motor vehicle was exercising due care; and (2) the person injured was blocking traffic in a public right-of-way while participating in a protest or demonstration. (b) This section does not affect a person's liability for an injury caused by grossly negligent conduct.