Mo. Rev. Stat. § 304.080: Handicapped persons with white cane or dog, driver to take all necessary precautions — cane or dog not required to enforce rights, when.

The driver of a vehicle approaching a person with a visual, aural or physical disability who is carrying a cane predominantly white or metallic in color, with or without a red tip, or using a guide dog, hearing dog or service dog shall yield to such pedestrian, and any driver who fails to take such precautions shall be liable in damages for any injury caused such pedestrian and any injury caused to the pedestrian's guide dog, hearing dog or service dog; provided that such a pedestrian not carrying such cane or using a guide dog, hearing dog or service dog in any of the places, accommodations or conveyances listed in section 209.150 shall have all of the rights and privileges conferred by law upon other persons.