Any driver of a vehicle who knowingly approaches within three feet of a person who is in the roadway or at an intersection and who is wholly or partially blind and who is carrying a cane or walking stick white in color, or white tipped with red, or who is using a dog guide wearing a specialized harness, or who is wholly or partially deaf and is using a signal dog wearing an orange identifying collar, or who is physically handicapped and is using a service dog, shall immediately come to a full stop and take such precautions before proceeding as may be necessary to avoid accident or injury to the person wholly or partially blind, deaf or physically handicapped. For purposes of this section a “dog guide” means any dog that is specially trained to guide a blind person.
(`90 Code, § 20-105)